Logitech K400 Plus Wireless Touch TV Keyboard With Easy Media Control and Built-in Touchpad, HTPC Keyboard for PC-connected TV, Windows, Android, Chrome OS, Laptop, Tablet - Black : Electronics
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pi-top Bluetooth 3.0 Full-Size Keyboard with Built-in Rechargeable Battery and Trackpad. for Raspberry Pi, PC, Mac and pi-top [4], QWERTY US Layout (B1.0) : Electronics
Logitech's K400 Plus is the perfect Raspberry Pi keyboard at just $20