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Black compact mechanical keyboard with blue switches and RGB backlighting

Corn Electronics

Corn Electronics GK21S Gaming Keyboard Blue Switch Black 750mAh Bluetooth 5.1

SKU CH-DPCW-C5N9J

A compact mechanical keyboard kit with hot-swappable blue switches, per-key RGB lighting, Bluetooth 5.1 and USB-C dual-mode connectivity, plus a 750 mAh battery for wireless play

  • Key SwitchBlue Switch
  • Keyboard ColorBlack

Key Switch Type Blue Switch

Keyboard Color Black

  • 32-bit MCU delivers responsive keystroke processing
  • 750 mAh battery powers extended wireless sessions
  • Bluetooth 5.1 and USB-C give dual-mode connectivity
  • Hot-swappable Kailh sockets let you change switches without soldering
  • 8 million-colour per-key RGB with music-reactive effects

Compact Gaming Keyboard for Custom Builds

The Corn Electronics GK21S is a compact mechanical keyboard designed for enthusiasts who want a hot-swappable platform. It uses Blue switches for tactile, clicky feedback and arrives in a black finish. The 32-bit MCU and 8 MB flash memory handle onboard profile storage without relying on host software.

Dual-Mode Connectivity and Switch Freedom

A USB Type-C cable provides wired operation while Bluetooth 5.1 adds a wireless link, letting the board pair with compatible devices without a dongle. Kailh hot-swap sockets accept any three- or five-pin MX-style switch from Cherry, BOX, Gateron or similar brands, so users can change feel without soldering. The PCB also supports plate-mount stabilisers for larger keys.

Per-Key Lighting and Macro Layers

Three 256-level LED drivers produce 16.8 million colours per key with a south-facing LED layout that clears interference with most keycap profiles. Firmware includes music-reactive lighting, sound-control effects and three programmable layers for macros and remaps, all configurable through the supplied driver software. A 750 mAh lithium cell powers the wireless mode.

Highlights

  • 32-bit MCU delivers responsive keystroke processing
  • 750 mAh battery powers extended wireless sessions
  • Bluetooth 5.1 and USB-C give dual-mode connectivity
  • Hot-swappable Kailh sockets let you change switches without soldering
  • 8 million-colour per-key RGB with music-reactive effects

Specifications

Key SwitchBlue Switch
Keyboard ColorBlack

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Questions about this item

How long does the 750 mAh battery last under sustained Bluetooth 5.1 use?

The keyboard runs on a 750 mAh lithium battery charged via the Type-C port; actual run time varies with RGB brightness and usage pattern.

Does the board get loud or hot during all-day typing with the Blue switches?

Blue switches produce a distinct click sound but the PCB and plate-mount stabilisers add no extra noise; the low-power 32-bit MCU and LED drivers generate negligible heat.

What stabiliser type must the case already have for this PCB to fit?

The PCB supports plate-mount stabilisers, so the case or plate must accept that mounting style.

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