Keyboards / Compare

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

A

Product A: Razer

BlackWidow V4 X

69 of 164 known

Change Razer BlackWidow V4 X

Compare the Redragon K521-R 104-Key Wired Membrane Gaming Keyboard with

Search keyboards

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

Compare the Razer BlackWidow V4 X with

Search keyboards

All 164 fields

Every value links to where we found it.

Only differences

ARazer BlackWidow V4 X

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

General

5 of 9 differ

Series

BlackWidow V44Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 2026

Not available

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

RZ03-0470, RZ03-04700200-R3U1, RZ03-04701900-R3U15Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 2026

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.

18 July 20234Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 2026

Not available

Status

Available5Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 2026Exact Black standard US keyboard remains offered in maker store.

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.

$129.994Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 2026Exact V4 X launch MSRP USD 129.99.

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.

€149.994Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 2026Exact V4 X European launch MSRP EUR 149.99. Tax treatment not separately stated.

Not available

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

Not available

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

Black5Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 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-xRead 23 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-xRead 23 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

2 of 12 differ

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

Full size3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 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.

ANSI5Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 2026US Layout and ANSI gallery reference.

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

US Layout5Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 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.

Not available

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/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Maker layout map 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/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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

Not available

Not available

Switches

12 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-xRead 23 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

Clicky, Silent linear1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026

Not available

Switch maker

Razer1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026

Not available

Switch models

Razer Green Mechanical Switches Gen-3, Razer Yellow Mechanical Switches Gen-31Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026Standard Black model is sold with Green Clicky and Yellow Linear switches. Licensed color editions are not separately cataloged.

Not available

Switch stem

MX cross7Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 23 October 2026Maker Gen-3 switches use cross stems with dual side walls.

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.

45 to 50gf4Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 20265Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 20266Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04701900-R3U1Read 23 October 20267Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 23 October 2026

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.

1.2 to 1.9mm4Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 20265Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 20266Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04701900-R3U1Read 23 October 20267Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 23 October 2026

Not available

Total travel

3.5 to 4mm4Press releaserazer.com/newsroom/product-news/blackwidow-v4-and-blackwidow-v4-xRead 23 October 20265Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 October 20266Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04701900-R3U1Read 23 October 20267Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 23 October 2026

Not available

Rated keystrokes

100million7Maker product pagerazer.com/gaming-keyboards-accessories/razer-mechanical-switchesRead 23 October 2026Green and Yellow table explicitly states 100 million. Current V4 X FAQ separately corroborates 100 million.

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

Yes1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026Razer Snap Tap through current Synapse 4. Not claimed as a 2023 launch feature.

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.

None9Retailer pagetarget.com/p/-/A-89156704Read 23 October 2026Target expert support answer explicitly identifies soldered switches and no hot-swap for exact V4 X.

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-xRead 23 October 2026

Not available

Keycaps

1 of 5 differ

Keycap material

ABS1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026

Not available

Legend method

Doubleshot1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 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.

Yes8Reviewarabgamerz.com/reviews/razer-blackwidow-v4-x-reviewRead 23 October 2026Review states RGB light passes through keycaps.

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 X

Connection	Polling rate (Hz)
USB (wired)	1,000

Source3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026Exact V4 X technical table says up to 1000 Hz. It is USB wired only. The standard V4 and V4 Pro 8000 Hz values are excluded.

BRedragon K521-R 104-Key Wired Membrane Gaming Keyboard

Not available

Max polling rate

1,000Hz=CalculatedFrom Polling rate per connection

Not available

Polling rate (wired)

1,000Hz=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

Yes3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026

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

4 of 18 differ

Connections

USB (wired)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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

No8Reviewarabgamerz.com/reviews/razer-blackwidow-v4-x-reviewRead 23 October 2026Exact review explicitly states non-detachable braided cable.

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

None8Reviewarabgamerz.com/reviews/razer-blackwidow-v4-x-reviewRead 23 October 2026Fixed integrated cable. No detachable keyboard input socket.

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/BLACKWIDOWV4X-00000659-en.pdfRead 23 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

Braided8Reviewarabgamerz.com/reviews/razer-blackwidow-v4-x-reviewRead 23 October 2026

Not available

Cable length

Not available

Not available

USB passthrough

No3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026

Not available

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

Not available

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 aluminum alloy top case and plastic bottom case2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 20268Reviewarabgamerz.com/reviews/razer-blackwidow-v4-x-reviewRead 23 October 2026Exact review identifies aluminum upper and plastic lower case. Maker manual identifies 5052 alloy upper.

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.

PCB foam2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026

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

4 of 7 differ

Backlight

RGB per key1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 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

Not available

Not available

Lighting sensors

Not available

Not available

Lighting sync

Razer Chroma RGB1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026

Not available

Controls

5 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.

Fn layer2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 9 uses Fn+Insert/Home/Page Down for playback and Fn+Delete for mute.

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.

02Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Playback and mute are Fn shortcuts. Roller is separate and no dedicated physical media buttons appear on complete map.

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/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026No rotary knob. The horizontal roller is represented by volume_control.

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.

62Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026

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/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026

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

Software

8 of 10 differ

Software

Razer Synapse 43Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026Current support lists Synapse 4. Original manual describes Synapse 3.

Not available

Software runs on

Windows3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026

Not available

Open firmware

Not available

Not available

Onboard memory

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 5 explicitly states hybrid onboard storage for five profiles. Current EU page says None. Manual is preferred, with conflict reported for human review.

Not available

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

52Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 5 states hybrid storage for up to five profiles. Current EU tech table says onboard memory None, while the exact original manual says five. Manual is preferred under source hierarchy. No verified later hardware change found.

Not available

Macros

Yes2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 13 Hypershift is a secondary key assignment set in addition to standard mapping.

Not available

User firmware updates

Yes3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 October 2026Exact RZ03-0470 firmware updater is listed as article 14183.

Not available

Ergonomics

0 of 4 differ

Wrist rest

None3Maker product pagemysupport.razer.com/app/answers/detail/a_id/13223Read 23 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.

Width466Depth152.5Height39.6mm(18.3 × 6 × 1.6 in)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 5 approximate size 466 x 152.5 x 39.6 mm. Current support page gives 43.9 mm height. Manual takes priority.

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.

1,087g(2.4 lb)2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 5 approximate weight 1087 g. Cable is permanently attached and included. Current support page gives 1136.3 g. Manual takes priority.

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

Not available

In the box

1 of 3 differ

In the box

Razer BlackWidow V4 X, Important Product Information Guide2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026Printed page 3 lists keyboard and Important Product Information Guide. Fixed cable is part of keyboard.

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

Not available

Not available

Spare switches

Not available

Not available

Links

Not compared

Product page

www.razer.com/gaming-keyboards/razer-blackwidow-v4-x5Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-x/RZ03-04700200-R3U1Read 23 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

www.razer.com/gaming-keyboards/razer-blackwidow-v4-x2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 October 2026

Not available

Manual

dl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdf2Owner's manualdl.razerzone.com/master-guides/RazerSynapse3/BLACKWIDOWV4X-00000659-en.pdfRead 23 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.

2years1Maker product pagerazer.com/gaming-keyboards/razer-blackwidow-v4-xRead 23 October 2026

Not available

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