Amazon.com: Logitech USB 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
Buy New Usb Receiver Wireless Dongle Receiver USB Adapter for logitech mk220/mk270 at affordable prices — free shipping, real reviews with photos — Joom
Logitech Unifying Receiver for Connecting Multiple Devices