Logitech K270 Wireless Keyboard with Unifying Receiver
Amazon.co.jp: Logicool SIGNATURE K855BG Wireless Mechanical Keyboard, TTC, Red Switch, Linear, Bluetooth, Logi Bolt, Not Unifying, Compact, Blue Gray & LBUSB1 Logi Bolt USB Receiver, Windows Mac, Chrome, OS, Black : Computers
Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black : Electronics