Logitech Unifying Receiver for Connecting Multiple Devices
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 : Amazon.co.uk: Computers & Accessories
Can you use multiple Logitech receivers with one computer? - Quora
Best Buy: Logitech USB Unifying Receiver 910-005235
LOGITECH Bolt USB Receiver : Amazon.co.uk: Computers & Accessories