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
Amazon.co.jp: Set Purchase: Logitech MK245nWH MK245 Wireless Mouse Keyboard Set, White & Elecom M-FIR08DRBK Wireless Mouse (Receiver Included), Size M, 3 Buttons, No Battery Replacement Required, Power Saving, Black : Computers