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

A

Product A: Razer

BlackWidow V4

77 of 164 known

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B

Product B: Redragon

K521-R 104-Key Wired Membrane Gaming Keyboard

46 of 164 known

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Every value links to where we found it.

Only differences

ARazer BlackWidow V4

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

General

3 of 9 differ

Series

BlackWidow1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

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

RZ03-04690200-R3U1, RZ03-04691Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Reference is exact Black US SKU fitted with Green Gen-3 clicky switches. Yellow-switch, regional and special-edition variants are not inherited.8Regulatory filingdl.razerzone.com/en/compliance/EU%20Declaration%20of%20Conformity%20for%20BlackWidow%20V4%20%28RZ03-0469%29.pdfRead 7 October 2026Official factory model RZ03-0469 explicitly appears with exact US Green sales code RZ03-04690200-R3U1 in declaration. Other regional codes are not mapped to guessed layouts or switches.

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

8402729033536Retailer pagebhphotovideo.com/c/product/1851676-REG/razer_rz03_04690200_r3u1_blackwidow_v4_mechanical_gaming.html/overviewRead 7 October 2026B&H explicitly identifies manufacturer RZ03-04690200-R3U1 and Razer Green Clicky switches, with UPC 840272903353. Maker GTIN not found. Only exact US Green identifier, not Yellow or other regional layouts.

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.

18 July 20235Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 7 October 2026

Not available

Status

Available1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Exact RZ03-04690200-R3U1 Green US keyboard is currently orderable from maker. Current sale price is not stored as launch price. Other store recommendations and Pro/75/HyperSpeed stock are excluded.

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.

$169.995Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 7 October 2026Maker launch Price and availability section. Exact Black complete keyboard, USD MSRP before sales tax. EUR MSRP omitted because VAT treatment was not confirmed.

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/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026US model reference in complete keyboard layout drawing has rectangular Enter and ANSI left Shift geometry.

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/RZ03-04690200-R3U1Read 7 October 2026Maker selected US layout. Other regional key counts are not transferred.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Counted on the complete US ANSI keyboard layout drawing. Standard full-size US typing/function block has 104 keys. Separate macro keys/buttons, media buttons and rotary controls 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Complete physical key drawing has Windows legends.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Complete exact-model layout drawing and maker form-factor description.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 202675% drawing has a compact right-edge navigation column. Full-size drawing has the full six-key navigation block.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Complete exact-model layout drawing shows staggered alphanumeric rows.

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

No1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Maker classification identifies Standard Height rather than low-profile construction.

Not available

Switches

11 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.

Mechanical1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 October 2026Manufacturer selected switch description, Tactile and Quiet for Orange, Tactile and Clicky for Green. Quiet alone is not silently damped.

Not available

Switch maker

Razer1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

Switch models

Razer Green Clicky Mechanical Switch Gen-34Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026Maker timeline states that Green Clicky and Yellow Linear Mechanical Switches Gen-3 were introduced with the BlackWidow V4 line in 2023. The exact selected US SKU maker page identifies Green switches.

Not available

Switch stem

MX cross4Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026Mechanical Switches Gen-3 comparison lists cross stems with dual side walls, compatible with MX-style keycaps.

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.

50gf4Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026Maker Mechanical Switches Gen-3 comparison, Orange column for 75% and Green column for full-size reference. Published as 50 g actuation force.

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.

1.9mm4Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026Maker Gen-3 comparison. Orange 2.0 mm, Green 1.9 mm.

Not available

Total travel

4mm4Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026Maker Gen-3 comparison. Orange 3.5 mm, Green 4.0 mm.

Not available

Rated keystrokes

100million4Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 5 October 2026

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-v4Read 7 October 2026Current maker FAQ states Snap Tap latest-input priority via Razer Synapse 4. This is a later software feature, not a launch-firmware claim.

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.

Not available

Not available

Compatible switches

Not available

Not available

Stabilizers

Not available

Not available

Factory-lubed stabilizers

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

Keycaps

1 of 5 differ

Keycap material

ABS1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

Legend method

Doubleshot1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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

Not available

Not available

Keycap thickness

Not available

Not available

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

Yes7Reviewrtings.com/keyboard/reviews/razer/blackwidow-v4Read 7 October 2026Reviewer tests Yellow switches but explicitly describes common full-size BlackWidow V4 stock doubleshot ABS keycap legends, with Green listed as alternative switch option. Same maker stock keycaps apply to Green SKU. No force, latency or Green-lubing values borrowed from Yellow test.

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

3 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

Connection	Polling rate (Hz)
USB (wired)	8,000

Source2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Technical specifications section says up to 8000 Hz. The keyboard has only a wired USB data connection. Intermediate report-rate settings are not inferred.

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Max polling rate

8,000Hz=CalculatedFrom Polling rate per connection

Not available

Polling rate (wired)

8,000Hz=CalculatedFrom Polling rate per connection

Not available

Polling rate (2.4 GHz)

Not available

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.

Not available

Not available

Anti-ghosting

Yes9Maker product pagemysupport.razer.com/app/answers/detail/a_id/13219/kw/blackwidow%20softwareRead 7 October 2026Maker full technical table for BlackWidow V4 RZ03-0469 explicitly states Anti-Ghosting Yes. USB-wired reference. This does not specify an N-key rollover count or scan frequency.

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

5 of 18 differ

Connections

USB (wired)1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

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

Wireless technology

Not available

Not available

Bluetooth

Not available

Not available

Bluetooth device slots

Not available

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.

Not available

Not available

Receiver connector

Not available

Not available

Receiver storage in keyboard

Not available

Not available

Receiver shared with other devices

Not available

Not available

Wireless range

Not available

Not available

Detachable cable

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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

Braided3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4Read 7 October 2026Maker exact BlackWidow V4 family states included braided USB-A to USB-C cable. No rubber/coiled guess and no cable length inferred.

Not available

Cable length

Not available

Not available

USB passthrough

No1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Pro includes USB 2.0 passthrough, while the non-Pro and 75% maker tables explicitly say none.

Not available

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

Windows, macOS2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Original exact master-guide printed page 4 requirements artwork explicitly Windows 10 64-bit or higher and USB-A. Current maker model-specific Synapse for Mac supported list independently adds macOS, requiring Apple Silicon and macOS 15 Sequoia or above. No generic USB-HID compatibility inferred for Linux or consoles.10Maker product pagemysupport.razer.com/app/answers/detail/a_id/14809/kw/razer%20huntsman%20rz03-Read 7 October 2026Maker Synapse for Mac supported-device list updated August 21 2026 explicitly includes BlackWidow V4 RZ03-0469. Exact US Green SKU is identified under this model in the conformity declaration. Mac preview requires Apple Silicon and macOS 15 Sequoia or above. Original Windows key legends remain.11Maker product pagerazer.com/synapse-4-macRead 7 October 2026Current maker Mac-preview requirements: Apple Silicon chip-based Mac running macOS 15 Sequoia and above. Exact keyboard model support separately proved by supported-device table.

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

None of 16 known

Battery type

Not available

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.

Not available

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.

Not available

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.

Not available

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

Not available

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

Not available

Not available

Solar charging

Not available

Not available

Battery indicator

Not available

Not available

Build

3 of 8 differ

Case material

5052 aluminium alloy top case1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Only the specified 5052 alloy top case is represented. Lower housing material is not inferred.

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

Not available

Not available

Mount style

Not available

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 foam2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Manual describes foam in the bottom case and between the circuit board and top case. These are case foam and plate foam. No undocumented layer is added.

Not available

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

5 of 7 differ

Backlight

RGB per key3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4Read 7 October 2026

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

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

Lighting sensors

Not available

Not available

Lighting sync

Razer Chroma RGB3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4Read 7 October 2026

Not available

Controls

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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.

Dedicated1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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.

41Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Physical media buttons, excluding the roller and its possible press action.

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

Volume control

Roller1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026A volume roller is fitted, with no separate rotary knob in the complete device layout.

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.

61Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026Six separate macro keys on the left of the typing area.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026

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

Software

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Software

Razer Synapse2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026

Not available

Software runs on

Windows, macOS2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Read manual requirements drawing names Windows 10 64-bit or higher. Basic USB input compatibility on other platforms is not inferred.10Maker product pagemysupport.razer.com/app/answers/detail/a_id/14809/kw/razer%20huntsman%20rz03-Read 7 October 2026Maker Synapse for Mac supported-device list updated August 21 2026 explicitly includes BlackWidow V4 RZ03-0469. Exact US Green SKU is identified under this model in the conformity declaration. Mac preview requires Apple Silicon and macOS 15 Sequoia or above. Original Windows key legends remain.11Maker product pagerazer.com/synapse-4-macRead 7 October 2026Razer Synapse for Mac and Razer Chroma App preview for macOS. Requires Apple Silicon and macOS 15 Sequoia or above. Not inherited from deprecated Synapse2 generic Mac support.

Not available

Open firmware

Not available

Not available

Onboard memory

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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/RZ03-04690200-R3U1Read 7 October 2026Hybrid onboard storage, up to five profiles. This does not establish onboard macro execution.

Not available

Macros

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 20269Maker product pagemysupport.razer.com/app/answers/detail/a_id/13219/kw/blackwidow%20softwareRead 7 October 2026Maker expressly states On-the-Fly Macro Recording only works while Razer Synapse is installed and running. This qualifies existing recording feature. Recording condition does not alone establish whether a previously assigned sequence replays from onboard storage, so macros_onboard remains unknown.

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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Hypershift is a secondary mapping layer in addition to the standard mapping. Profile slots and light-effect layers are excluded.

Not available

User firmware updates

Yes9Maker product pagemysupport.razer.com/app/answers/detail/a_id/13219/kw/blackwidow%20softwareRead 7 October 2026Maker lists user firmware update v1.5.0_r1 dated January 8 2026 for RZ03-0469 with updater instructions. The generic wireless-dongle instruction is a template error and does not change this wired model’s connection set.12Maker product pagemysupport.razer.com/app/answers/detail/a_id/13901/kw/razer%20blackwidow%20downloadRead 7 October 2026Exact maker firmware article 13901 names applicable RZ03-0469 and v1.5.0_r1 dated 8 January 2026, with user updater instructions and Mac sleep fix. Full public indexed original answer independently read after direct open yielded Oracle pre-page shell. Generic dongle instruction is template contamination, not evidence of wireless hardware. No firmware installed.

Not available

Ergonomics

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Wrist rest

Detachable1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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

Magnetic plush leatherette1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 October 2026

Not available

Tenting

Not available

Not available

Tenting angles

Not available

Not available

Dimensions and weight

4 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.

Width466Depth152.5Height39.6mm(18.3 × 6 × 1.6 in)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Manual Technical specifications, Without wrist rest. Maker Length along the key rows is normalized to keyboard width. Maker Width front-to-back becomes depth. Approximate values with supplied keycaps.

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

Width466Depth237.5Height39.6mm(18.3 × 9.4 × 1.6 in)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Manual Technical specifications, With wrist rest. Maker Length becomes width and Width becomes depth.

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.

1,087g(2.4 lb)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Maker approximate Without wrist rest figure for the keyboard. No retailer shipping or packaging weight used.

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.

1,327g(2.9 lb)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026Maker approximate With wrist rest figure.

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

1 of 2 differ

Platform certifications

Not available

Not available

Other certifications

CE, UKCA8Regulatory filingdl.razerzone.com/en/compliance/EU%20Declaration%20of%20Conformity%20for%20BlackWidow%20V4%20%28RZ03-0469%29.pdfRead 7 October 2026Maker declaration explicitly lists exact US Green SKU under RZ03-0469 and states that products/packaging bear CE and UKCA marks. Rendered marks inspected. Conformity is self-declared, not independent third-party certification. No radio FCC ID invented for wired keyboard.

Not available

In the box

2 of 3 differ

In the box

BlackWidow V4, Magnetic plush leatherette wrist rest, USB Type A to Type C cable, Important Product Information Guide2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 October 2026What is inside section. Supplied wrist rest is identified in the device-layout legend.

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

Type	Count
USB Type A to USB Type C cable	1

Source2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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-v41Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4/RZ03-04690200-R3U1Read 7 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/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdf2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4-00000647-en.pdfRead 7 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.

2years3Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4Read 7 October 2026US maker page warranty section.

Not available

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