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Gray prismatic aluminum gaming keyboard kit, compact rectangular form with Type-C port and Bluetooth 4.0 connectivity

Corn Electronics

Corn Electronics GK21S Prismatic Aluminum Gaming Keyboard

SKU CH-SMNX-0V02F

A hot-swappable mechanical numpad kit with per-key RGB, Bluetooth 4.0 and USB-C, 750 mAh battery, and three programmable layers

  • Key SwitchNo
  • Keyboard ColorGray

Key Switch Type No

Keyboard Color Gray

  • 32-bit MCU enables fast response times
  • 8 MB flash stores three custom macro layers
  • 8 million colour LEDs with music-reactive effects
  • Hot-swappable Kailh sockets accept Cherry, BOX or Gateron MX switches
  • Bluetooth 4.0 and USB-C dual-mode with 750 mAh battery lasting over a month

Prismatic Aluminium Keyboard Kit

The Corn Electronics GK21S is a compact 21-key mechanical keyboard kit built around a prismatic aluminium case. It ships without switches so you can choose any three-pin or five-pin MX-compatible stem. A 32-bit MCU and 8 MB of onboard flash store three programmable layers and per-key lighting profiles.

Enthusiasts who want a DIY numpad or macro pad

This kit suits builders who enjoy soldering or hot-swapping their own switches and designing custom layouts. It is not for users who need a ready-to-type board with pre-installed switches and keycaps, nor for anyone requiring a full-size layout or dedicated function row.

Bluetooth 4.0 and USB-C dual-mode connectivity

The PCB includes a 750 mAh battery rated for over one month of typical daily use. A single 32-bit controller drives 16.8 million colours through three 256-channel LED drivers with music-reactive effects. Hot-swappable Kailh sockets and plate-mount stabiliser support complete the feature set.

Highlights

  • 32-bit MCU enables fast response times
  • 8 MB flash stores three custom macro layers
  • 8 million colour LEDs with music-reactive effects
  • Hot-swappable Kailh sockets accept Cherry, BOX or Gateron MX switches
  • Bluetooth 4.0 and USB-C dual-mode with 750 mAh battery lasting over a month

Specifications

Key SwitchNo
Keyboard ColorGray

Other versions of this model

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Questions about this item

Does the GK21S numpad kit include a mounting plate or stabilisers for assembly?

The PCB supports plate-mount stabilisers; a separate plate and stabilisers are required to complete the build.

How do I pair the GK21S via Bluetooth 4.0 without accidentally staying in wired mode?

Connect the Type-C cable first, then hold the designated Bluetooth key until the LED flashes to enter pairing mode.

When will the 750 mAh battery need recharging under typical daily use?

With up to four hours of daily use the battery lasts over one month before requiring a recharge via the Type-C port.

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