Keyboards / Compare

Razer BlackWidow V4 Low-profile HyperSpeed vs Redragon K521-R 104-Key Wired Membrane Gaming Keyboard

A

Product A: Razer

BlackWidow V4 Low-profile HyperSpeed

89 of 164 known

Change Razer BlackWidow V4 Low-profile HyperSpeed

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B

Product B: Redragon

K521-R 104-Key Wired Membrane Gaming Keyboard

46 of 164 known

Change Redragon K521-R 104-Key Wired Membrane Gaming Keyboard

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All 164 fields

Every value links to where we found it.

Only differences

ARazer BlackWidow V4 Low-profile HyperSpeed

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

General

3 of 9 differ

Series

BlackWidow1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

RZ03-05270200-R3U11Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Exact Black US reference with Green low-profile clicky switches. No sibling switch option or regional layout is inherited.

K521-R1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Product name Redragon K521-R 104-Key Wired Membrane Gaming Keyboard. Amazon calls the same listing K521, with model number K521.

GTIN / EAN

Not available

69503767253702Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboard.jsRead 23 October 2026Store product data: the one US variant has barcode 6950376725370.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

14 August 20255Press releaserazer.com/newsroom/product-news/razer-unveils-the-blackwidow-v4-low-profile-lineRead 5 October 2026

Not available

Status

Available1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Exact Green US RZ03-05270200-R3U1 store data reports inStock on October 8, 2026.

Available3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Amazon shows In Stock at 15.99 USD with 4K+ bought in the past month. Sold by Redragon Official. The maker store page shows Sold Out for the same board.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$229.996Press releasenordicgamesupply.com/blogs/news/razer-unveils-the-blackwidow-v4-low-profile-line-its-most-feature-rich-low-profile-gaming-keyboard-yetRead 5 October 2026Public distributor reprint of the maker August 14 launch release. Global Price and availability section gives USD MSRP, before sales tax.

Not available

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

Not available

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

US1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Store page ships to US and the variant is US.

ColoursiThe maker's own colour names

Black1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Black3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Item details: Color Black, Style Classic. The listing also sells other styles in other prices and layouts that are not this model. The Redragon store page links to this ASIN. Seller is Redragon Official.

Segment

Gaming1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Gaming1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Specification: Product Category Gaming Keyboard.

Sold asiParts fitted when sold. A complete keyboard includes switches and keycaps. Barebones includes neither.

Complete1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Complete1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Sold fully assembled with membrane keys.

Layout

1 of 12 differ

Form factoriLayout size or shape. A percentage describes the layout, not the number of keys.

Full size1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Full size1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Specification: Number of keys 104. Collection: Full-size Keyboards.

Layout standardiPhysical key layout standards sold for this model. Regional language names are listed separately.

ANSI2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

ANSI1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo: horizontal Enter, long left Shift and a backslash key above Enter. That is ANSI.

Regional layouts

US1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

US1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Variant name US.

Keys in regional layoutiPhysical typing and function keys in the stated regional layout. Separate media buttons, macro buttons and rotary controls are excluded. A Touch ID or Lock key in a key row counts, as on Apple keyboards.

1042Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Counted in complete US ANSI device-layout drawing: standard 87-key TKL or 104-key full-size typing/function block. Separate media, macro, battery and AI buttons and roller are excluded.

1041Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Specification: Number of keys 104. The maker photo shows a standard 104-key layout with the right Windows and menu keys replaced by Fn and a backlight key.

Key legends for

Windows2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Windows1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows a Windows logo key.

Numpad

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows a numpad.

Function row

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows F1 to F12.

Dedicated arrow keys

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows an inverted-T arrow cluster.

Navigation keysiAvailability of Home, End, Page Up and Page Down as dedicated keys or through an Fn layer.

Full2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Full1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows Ins, Home, Pg Up, Del, End and Pg Dn as separate keys.

Key stagger

Row-staggered2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Row-staggered1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows row-staggered keys.

Bottom row

Not available

Not available

Low profile

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Switches

13 of 25 differ

Switch sensing technologyiKey sensing technology. Hall effect and TMR are different sensor types. A mixed board is identified explicitly. Magnetic switch housing alone does not identify the sensor.

Low-profile mechanical1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Membrane1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Product name: Membrane Gaming Keyboard.

Switch feel

Tactile, Clicky1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Maker low-profile Green description identifies tactile and clicky feel.

Not available

Switch maker

Razer1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Switch models

Razer Low-profile Green Clicky Mechanical Switch3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026

Not available

Switch stem

Other4Maker product pagerazer.com/technology/razer-low-profile-mechanical-switchRead 5 October 2026Maker describes a modified cross stem with round walls. The unchanged schema does not name this exact low-profile fit. Standard MX or Choc compatibility is not asserted.

Not available

Actuation forceiForce at the point where a key registers. Initial spring force is not actuation force. Adjustable switches require a stated actuation setting.

45gf4Maker product pagerazer.com/technology/razer-low-profile-mechanical-switchRead 5 October 2026Green exact low-profile switch table gives 45 g.

Not available

Bottom-out forceiForce at the end of the switch travel. It is not the initial spring force or the tactile peak.

Not available

Not available

Tactile bump forceiPeak force of the tactile bump. It is not the force at initial movement or at bottom-out.

Not available

Not available

Actuation pointiDistance before a key registers. For adjustable boards, the default profile or setting is stated in the source note.

1.2mm4Maker product pagerazer.com/technology/razer-low-profile-mechanical-switchRead 5 October 2026Green exact low-profile switch table gives 1.2 mm.

Not available

Total travel

2.8mm4Maker product pagerazer.com/technology/razer-low-profile-mechanical-switchRead 5 October 2026Green exact low-profile switch table gives 2.8 mm.

Not available

Rated keystrokes

60million4Maker product pagerazer.com/technology/razer-low-profile-mechanical-switchRead 5 October 2026Green exact low-profile switch table rates 60 million versus generic keyboard launch claim up to 80 million. The named component table takes precedence.

Not available

Factory-lubed switches

Not available

Not available

Adjustable actuation

Not available

Not available

Actuation rangeiSelectable actuation distances. These are settings, not a measured usable travel range.

Not available

Not available

Actuation stepiSmallest documented increment between selectable actuation settings.

Not available

Not available

Per-key actuationiActuation can be configured individually for supported keys. The source note identifies any excluded keys.

Not available

Not available

Rapid trigger

Not available

Not available

Minimum rapid trigger movementiSmallest selectable movement used to reset or reactivate a key. This is a setting, not measured accuracy.

Not available

Not available

Multi-action keys

Not available

Not available

SOCD handling

Yes3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026

Not available

Analog inputiCan send variable gamepad or joystick input. Magnetic sensing or adjustable actuation alone does not establish analog output.

Not available

Not available

Hot-swap socketsiSwitches can be replaced without soldering. Magnetic compatibility must be checked separately.

None3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026Exact-model FAQ says the keyboard has no hot-swap capability.

Not available

Compatible switches

Not available

Not available

Stabilizers

Plate-mounted8Maker product pagemysupport.razer.com/app/answers/detail/a_id/15489Read 8 October 2026Exact full-size RZ03-0527 support technical specifications explicitly name lubricated plate-mount stabilizers with Krytox GPL 205g0. The public search-indexed specification was readable. Direct opening encountered the maker support bot check.

Not available

Factory-lubed stabilizers

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Keycaps

2 of 5 differ

Keycap material

PBT1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Legend method

Doubleshot1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Doubleshot1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: Double-shot keycaps (permanent legends).

Keycap profile

Low profile9Reviewtweaktown.com/reviews/11154/razer-blackwidow-v4-low-profile-hyperspeed-keyboard-a-thinner-winner/index.htmlRead 8 October 2026Design section expressly describes doubleshot low-profile PBT keycaps on the full-size keyboard. Reviewed US Yellow switch configuration RZ03-05271600-R3U1. This keycap form is shared by the full-size Green reference and supported by the maker low-profile keycap design. Switch-specific and measured results are not imported.

Not available

Keycap thickness

Not available

Not available

Shine-through legendsiLight passes through the legends. Translucent keycap sides alone do not count.

Yes3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Specification: Two-color translucent keycaps. The maker photos show the legends lit by the backlight.

Performance

4 of 11 differ

Polling rate per connectioniDocumented report rates for each connection. Required receivers or optional adapters are identified in the row and source note.

ARazer BlackWidow V4 Low-profile HyperSpeed

Connection	Polling rate (Hz)	Receiver or adapter
2.4 GHz	1,000	Included Razer HyperSpeed Wireless dongle
2.4 GHz	4,000	Optional Razer HyperPolling Wireless Dongle

Source3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026HyperSpeed wireless section specifies 1000 Hz. Current HyperPolling section explicitly permits 4000 Hz with a separately sold dongle. Wired and Bluetooth ceilings and intermediate settings remain unknown.

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Max polling rate

4,000Hz=CalculatedFrom Polling rate per connection

Not available

Polling rate (wired)

Not available

Not available

Polling rate (2.4 GHz)

4,000Hz=CalculatedFrom Polling rate per connection

Not available

Polling rate (Bluetooth)

Not available

Not available

Scan rateiHow often the keyboard reads its switches. A USB report rate does not establish a scan rate.

Not available

Not available

Input latency (claimed)iMaker-published input or response latency with conditions in the source note. Do not calculate this from polling rate.

Not available

Not available

Key rollover per connectioniKeys registered simultaneously over the stated connection. Connection is omitted if the source does not specify it.

ARazer BlackWidow V4 Low-profile HyperSpeed

Rollover
NKRO

Source1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Exact SKU embedded Others specification states N-key rollover. Connection is not identified, so no wired, 2.4 GHz or Bluetooth connection cell is inferred.

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Anti-ghosting

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Exact SKU embedded Others specification explicitly lists Anti-ghosting.

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: 25-key rollover anti-ghosting. The Amazon listing says 19 keys anti-ghosting. Neither figure fits a rollover option, so key_rollover is left out.

Adjustable debounce

Not available

Not available

Minimum debounce

Not available

Not available

Measured

None of 7 known

Latency per connection (measured)iReviewer measurements for one tested setup per row. Settings and test method are stated in the source note. Missing conditions are not inferred.

Not available

Not available

Actuation point (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Total travel (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Operating force (measured)iReviewer-measured force at actuation. The switch and actuation setting are stated in the source note.

Not available

Not available

Typing noise (measured)iReviewer-measured A-weighted typing sound level. Measurement distance and conditions are stated in the source note.

Not available

Not available

Battery life (measured)iMeasured by a reviewer, not claimed by the maker

Not available

Not available

Weight (measured)iReviewer-measured keyboard weight without cable or wrist rest. The tested configuration is stated in the source note.

Not available

Not available

Connectivity

13 of 18 differ

Connections

USB (wired), 2.4 GHz, Bluetooth1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Shop connectivity table lists HyperSpeed 2.4 GHz, Bluetooth and TypeC. Manual wired instructions separately confirm USB data operation.

USB (wired)1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Specification: Connection Wired.

Wireless technology

Razer HyperSpeed Wireless1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Bluetooth

Not available

Not available

Bluetooth device slots

32Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Bluetooth setup section explicitly describes three saved pairing profiles.

Not available

Devices it can switch betweeniDistinct device connections available for switching. Do not infer this by adding wireless modes or paired Bluetooth slots.

Not available

Not available

Device switchingiControl used to switch between paired device hosts. Connection-mode and OS switches are described separately.

Button2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Wireless host selection uses Fn shortcuts on TKL, versus dedicated buttons on full-size. The rear Wired/Wireless power-mode switch is a separate control.

Not available

Receiver connector

USB-A2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Included small dongle drawing has a USB-A host plug. This does not refer to the USB-C socket on the adapter.

Not available

Receiver storage in keyboard

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Exact-model device-layout underside drawing identifies a wireless dongle compartment.

Not available

Receiver shared with other devices

Yes3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026FAQ explicitly permits pairing a compatible wireless Razer mouse to the keyboard included dongle. Not a multi-computer claim.

Not available

Wireless range

Not available

Not available

Detachable cable

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

No1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Same photo: the cable is fixed.

Port on keyboard

USB-C2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

None1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Maker photo shows the cable leaving the top edge and no port on the keyboard.

Cable plug

USB-A2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

USB-A3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Item details: Connectivity Technology USB-A. Some regional retailers describe a Type-C cable for the RGB Netherbane, which is not this listing.

Cable

Braided10Retailer pagejbhifi.com.au/blogs/games/less-is-more-with-razer-blackwidow-v4-low-profile-hyperspeed-wirelessRead 8 October 2026October 28, 2025 article describes the full-size keyboard, including four dedicated macro buttons, and explicitly identifies its included braided USB charging cable. Read from the normal page embedded article text. The cable length and exact regional SKU are not stated.

Not available

Cable length

Not available

Not available

USB passthrough

No1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Works withiSystems on which the keyboard works. Configuration software may have narrower system support.

Windows2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Exact full-size master guide documents Windows key functions, Windows keyboard properties and Windows shortcuts on printed pages 17 and 21. Printed page 3 requires Windows 10 64-bit or higher for Synapse, which is a software requirement rather than a claimed minimum version for basic keyboard input. Other operating systems were not proved.

Windows, macOS1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: Windows 10/11 plus macOS compatible. The Specification row lists only Windows 10 down to Windows XP. The Features line and the Amazon listing are stored.

Consoles

Not available

PlayStation, Xbox3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Title: Compatible with PC, Mac, PS4/5, Xbox. Bullet: Windows XP to Win11, PS4-5, Xbox, MacOS, no driver required. The Redragon store page does not mention consoles.

Battery

7 of 16 differ

Battery type

Li-ion2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Battery warning section identifies an internal rechargeable Li-ion battery. Capacity and user replacement are not stated.

Not available

Number of batteriesiNumber of replaceable AA or AAA cells required. Internal rechargeable battery packs are not counted here.

Not available

Not available

Battery capacity

Not available

Not available

User-replaceable battery

Not available

Not available

Battery life per mode (claimed)iMaker estimates. Store one published native duration unit per row: hours, days or months. Days and months describe calendar use including idle time, not continuous runtime. Do not convert calendar estimates into hours. Connection, lighting and polling rate are included only when published. Brightness, workload, screen status, sleep settings and up-to qualifiers go in the source note.

ARazer BlackWidow V4 Low-profile HyperSpeed

Lighting	Hours (h)
Off	980

Source3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026Up to 980 hours only in Power Saving Mode, which turns off keyboard lighting, reduces polling rate and pauses Synapse connectivity. The maker does not state the connection or numeric polling rate for this claim, so those nested cells are omitted. This is not ordinary gaming runtime.

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Longest battery life (claimed)iLongest maker estimate published in hours across the listed modes. Rows published in days or months do not contribute. Conditions can differ between products.

980h=CalculatedFrom Battery life per mode (claimed)

Not available

Battery life, lighting offiLongest maker estimate published in hours with lighting off. Calendar-day and calendar-month estimates are not converted and do not contribute.

980h=CalculatedFrom Battery life per mode (claimed)

Not available

Battery life, lighting oniLongest maker estimate published in hours with lighting enabled. Calendar-day and calendar-month estimates are not converted and do not contribute. Brightness and display conditions are stated in the source note.

Not available

Not available

Battery life, backlight on (claimed)iLongest maker up-to estimate published in calendar days with backlighting enabled. Includes idle time and the source-defined usage pattern, not continuous runtime. Brightness, workload, connection and sleep conditions remain in the table and source note. Hours and months are not converted.

Not available

Not available

Battery life, backlight off (claimed)iLongest maker up-to estimate published in calendar months with backlighting off. Includes idle time and the source-defined usage pattern, not continuous runtime. Workload, connection and sleep conditions remain in the table and source note. Hours and days are not converted.

Not available

Not available

Charging port

USB-C2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Not available

Full charge timeiPublished time for a full charge. Approximate times remain qualified in the source note.

Not available

Not available

Quick charge

Not available

Not available

Use while charging

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Charging section explicitly says the keyboard can continue to be used while plugged in. Wired data-mode instructions are separate.

Not available

Solar charging

Not available

Not available

Battery indicator

LED, Key lighting2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Charging/status indicator LED plus number-row illuminated battery display documented in Using section.

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Build

5 of 8 differ

Case material

5052 aluminium alloy top case and ABS plastic bottom case1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

ABS3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Item details: Keyboard Plate Material ABS. Amazon names it plate material and it is stored as the case material.

Plate material

Steel1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Mount style

Top1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Flex cuts in PCB

Not available

Not available

Sound dampeningiDampening layers the maker or a review names. Foam whose position in the stack is not stated is foam. Films, pads and silicone parts that fit no other option are other.

Case foam, Plate foam1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Exact shop table names PCB and case foam. The model-specific exploded view identifies the upper layer as plate foam and lower layer as case foam.

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Typing anglesiKeyboard slope for each supported foot position, starting with the lowest. An adjustable-foot count does not establish angles. When the maker publishes only the angle with the feet out, that angle is stored alone.

Not available

Not available

Spill resistant

Not available

Yes1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: spill-resistant design plus ergonomic tilt.3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Infographic: Spill-resistant Protection. Prevent accidental spills from interrupting your game.

IP rating

Not available

Not available

Lighting

4 of 7 differ

Backlight

RGB per key7Reviewwindowscentral.com/accessories/keyboards/razer-blackwidow-v4-low-profile-hyperspeed-reviewRead 5 October 2026Public review explicitly describes per-key RGB lighting in its feature summary.

RGB zones1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: 6-zone RGB backlighting. Specification: Lighting Rainbow.

LED position

Not available

Not available

Lighting zones

Not available

61Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: 6-zone RGB backlighting.

Brightness levelsiSelectable onboard brightness steps. The source note states whether the off position is included.

Not available

41Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Features: 4 brightness levels. It is not stated whether off is counted.

Side or underglow lighting

Not available

Not available

Lighting sensors

Not available

Not available

Lighting sync

Razer Chroma RGB1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

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Controls

7 of 12 differ

Media keysiPlayback controlled by separate buttons, an Fn layer or a multifunction knob/rocker. Volume controls are listed separately, and knob presses are excluded from the separate media-button count.

Dedicated2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Fn layer3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Infographic: 12 multimedia functions through Fn plus F1 to F12 (media player, play/pause, volume down and up, mute, next and previous track, stop, e-mail, home page, calculator and lock keyboard).

Separate media buttonsiSeparate physical buttons for playback or mute, counted once each. Fn shortcuts, macro buttons, knob presses and roller presses are excluded.

32Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Device-layout diagram shows three dedicated playback buttons. Mute is the roller press and is excluded.

03Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026The photo shows no separate media buttons. Media functions are Fn layer shortcuts.

Volume control

Roller2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Keys3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Infographic: Fn plus F2 and F3 for volume down and up, Fn plus F4 for mute.

Knobs

02Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

01Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No knob in the maker photo.

Programmable knob

Not available

Not available

Knob press

Not available

Not available

Separate macro keysiSeparate physical keys or buttons intended for macros. Excludes ordinary remappable keys, media buttons and a dedicated software-launch button.

42Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Device-layout diagram labels four physical macro buttons M 1 through M 4. AI, battery and mode buttons are excluded.

01Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No separate macro keys in the maker photo.

Built-in screen

Not available

None1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No screen in the maker photo.

Touchpad

Not available

No1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No touchpad in the maker photo.

Fingerprint reader

Not available

No1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No fingerprint reader in the maker photo.

OS mode switch

Not available

Not available

Windows key lock

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Yes3Retailer pageamazon.com/dp/B0DRFGNWV1Read 23 October 2026Infographic: FN plus Win locks the Windows key.

Software

8 of 10 differ

Software

Razer Synapse2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Not available

Software runs on

Windows2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Read exact-model manual requirements list Windows 10 64-bit or later. Other software platforms are not inferred from generic Synapse support.

Not available

Open firmware

Not available

Not available

Onboard memory

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

Not available

Onboard profilesiProfiles stored on the keyboard, including fixed defaults when the maker counts them. Software-only profiles are excluded.

51Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026Hybrid onboard storage for up to five profiles. Not proof of stored macros.

Not available

Macros

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Not available

Macros stored onboardiRecorded command sequences run from keyboard storage without the configuration app. Onboard lighting or remapping alone does not establish this.

Not available

Not available

Key remapping

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Not available

LayersiTotal key mapping layers including the base layer. Lighting effect layers and profile slots are excluded.

22Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Hypershift is one secondary key-mapping layer above the standard mapping.

Not available

User firmware updates

Yes3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeedRead 8 October 2026Exact full-size FAQ tells users to update the keyboard firmware. The maker exact RZ03-0527 support article separately lists updater v1.4.1_r2, dated March 4, 2026.

Not available

Ergonomics

0 of 4 differ

Wrist rest

None1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

None1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026No wrist rest in the package contents.

Wrist rest material

Not available

Not available

Tenting

Not available

Not available

Tenting angles

Not available

Not available

Dimensions and weight

2 of 6 differ

DimensionsiKeyboard body dimensions with fitted keycaps, without wrist rest and with feet folded. Any different measurement condition is stated in the source note. Width is the longest side, depth runs front to back and height is the thickness. Map by size when the maker's labels differ.

Front height18.5mm5Press releaserazer.com/newsroom/product-news/razer-unveils-the-blackwidow-v4-low-profile-lineRead 5 October 2026Launch release explicitly says 18.5 mm front height. This is not maximum keyboard height and does not establish width or depth.

Width434Depth128Height31mm(17.1 × 5 × 1.2 in)1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Weight & Size: Product Size (L x W x H) 43.4X12.8X3.1cm. Mapped by size: width 434, depth 128, height 31. The measurement conditions are not stated.

Dimensions with wrist rest

Not available

Not available

Keyboard weightiKeyboard without cable or wrist rest. Weights that include accessories cannot be stored here. A cable that cannot be removed is included. Replaceable batteries are included, as built-in batteries are.

Not available

581g(1.3 lb)1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Weight & Size: Product Weight 0.581kg.

Weight including wrist restiKeyboard plus supplied wrist rest, excluding packaging. The source note identifies any included cable.

Not available

Not available

Box dimensions

Not available

Not available

Box weightiOne retail package including its contents. A multi-unit shipping carton weight is excluded.

Not available

Not available

Certifications

None of 2 known

Platform certifications

Not available

Not available

Other certifications

Not available

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In the box

2 of 3 differ

In the box

Razer BlackWidow V4 Low-profile HyperSpeed, Razer HyperSpeed Wireless Dongle + USB dongle adapter, USB Type A to Type C cable, Important Product Information Guide2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Exact-model What is inside section. No optional HyperPolling dongle included.

Keyboard, User Manual1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Package Contents: 1 x Keyboard, 1 x User Manual.

Cables included

ARazer BlackWidow V4 Low-profile HyperSpeed

Type	Count
USB Type A to USB Type C cable	1

Source2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Spare switches

Not available

Not available

Links

Not compared

Product page

www.razer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-low-profile-hyperspeed/RZ03-05270200-R3U1Read 8 October 2026

redragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboard1Maker product pageredragon.com/products/redragon-k521-r-104-key-wired-membrane-gaming-keyboardRead 23 October 2026Redragon US store page. The only variant is US at 25.99 USD and it shows Sold Out on the access date. The page has a Buy on Amazon button that links to Amazon listing B0DRFGNWV1. The page has no description text.

Spec sheet

Not available

Not available

Manual

dl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdf2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026

Not available

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

1 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

2years2Owner's manualdl.razerzone.com/master-guides/RazerSynapse4/BLACKWIDOWV4LOWPROFILEHYPERSPEED-00000716-en.pdfRead 8 October 2026Exact-model manual shows a 2-year warranty badge, US reference.

Not available

Both are also in the API. Back to all keyboards.