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gk21s gk21 hot swappable blue tooth bt dual mode pcb Custom Mechanical Keyboard Numpad Kit rgb smd switch leds type c usb port

Regular price $49.00

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Case Color



During COVID-19, If you do not receive the goods after 90 days, please contact us in time. We will contact the express company for you. If we confirm that the goods cannot arrive or are lost, we will refund to you.

If there is any defect or defect in the product you received, please contact us in time and attach video or picture description. After confirmation, we will send you a replacement product for free. Thank you for your understanding and support.

UPDATE - Since the COVID-19, the longest shipping time we encounter is over 140 days with free shipping. If you don't receive the parcel after 140 days, please feel free to contact us for a solution (refund or reshipment). NOTE - the 140-day starter is from the day you have the tracking info, NOT from the day when you place the order.

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

Return shipping fee is required. You need to pay return shipping fee for returns.


Where do I download software if I buy a keyboard that needs software?

Please check menu bar - download tab to download the software and instruction.

How do I choose what we want if i buy a custom kit?

If you buy a PCB kit, which has switch, cable colour and case colour option, please leave a note at checkout.

GK21S ABS Plastic Case Kit Edition

Pls pay attention:  To avoid damaging GK21s hot-swapping sockets, pls make sure your switches' pin is vertical, and you'd better not use used key switches with soldering tin.
  • GK21S Numpad=GK21S PCB+Plate+Stabilizer+CNC Case+Type C Cable (if you choose this option, you won't get keycaps and switches)
  • GK21S Kit1=GK21S Numpad+Gateron Switches x21(Pls choose from 3Pin SMD Red\Black\Brown\Blue\Green\Yellow\Clear)
  • GK21S Kit2=GK21S Numpad+Domikey Numpad Kit x1(Pls choose from Orange Dolch\Showa\Atlantis\Classic Dolch\1980s\Crisis\SEALs)
  • GK21S Kit3=GK21S Numpad+Gateron Switches x21(Pls choose from 3Pin SMD Red\Black\Brown\Blue\Green\Yellow\Clear)+Domikey Numpad Kit x1(Pls choose from Orange Dolch\Atlantis\Classic Dolch\1980s\Crisis\SEALs)
Pls, pay attention: Domikey Numpad Kit top row is TAB/SHIFT/END/BACKSPACE, not the same with GK21S Default top row Esc\Tab\Fn\Backspace, if you can't accept it, pls do not choose Domikey Numpad kit, thx.
If you connect it to your PC with cable, but it cant input, pls change it to cable mode first(when connect to pc with cable in Bluetooth mode, it cant work), you can press Fn+7\8\9(depends on which one is in Bluetooth mode) for 3 sec to change it to cable mode.
  • 32 bit MCU 
  • Built-in 8M Flash
  • 3 256*256*256LED driver chip supports 16.8Million colours LED 
  • Type-C USB cable+Bluetooth 5.1 Dual Mode
  • The lamp position is anti-RGB, compatible with Cherry, BOX, G axis and other three feet or five feet MX switch
  • Hot-pluggable Kailh connector
  • Support music rhythm and sound control, drive custom macro programming keys, three layers can be defined.
  • PCB support plate mount stabilizer.
  • Li-Battery is 750mAH
GK21S Driver and Software


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