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
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech USB Unifying Receiver Dongle for Mouse & Keyboard 910-005235 (10 Pack) - Walmart.com
How to pair more than one device with a Logitech receiver
Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) : Amazon.in: Computers & Accessories
Logitech USB Unifying Receiver Connect up to 6 Devices 2.4 GHz, NEW US | eBay