Original Logitech USB Unifying Receiver, 2.4 GHz, compatible logitech Unifying Devices for PC / Mac / Laptop | Lazada PH
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
Solaar' Lets You Manage Logitech's Unifying Receiver on Linux - OMG! Ubuntu
Zone Wireless Plus Unifying + Audio Receiver
Logitech M235 Wireless Mouse, 2.4 GHz with USB Unifying Receiver