Keyboards

r.Keys KUKEY42

A 42-key wireless split keyboard kit with an aluminum top plate, 17mm low-profile key pitch, a 25mm trackball on the right half and a horizontal rotary encoder for the left thumb.

Key specs auto-matched against source pages · Last verified: 2026-10-17

r.Keys KUKEY42
Image: © r.Keys (Manufacturer image)
~¥26,000

Where to buy

No US retailer found yet. Official site

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Pros

  • Wireless split design with built-in trackball and rotary encoder
  • Aluminum top plate gives a finished, product-like look
  • 17mm key pitch keeps finger travel short
  • Halves stack together magnetically for storage

Cons

  • Soldering kit; switches, keycaps, trackball and battery sold separately
  • Trackball is right side only, no left-handed build
  • Reviewers note the magnetic bottom cover detaches easily
  • Often out of stock

Specs

SplitSplit
StaggerColumnar
TentingNone
KeywellNo
Thumb clusterYes
Keys42
LayoutsCustom
SwitchesLow-profile
Hot-swapYes
FirmwareZMK
DIY kitYes
ConnectivityBluetooth
OSwindows, macos, linux
Released2025
Sources
AD · detail-mid

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