Logitech USB Unifying Receiver : Amazon.co.uk: Computers & Accessories
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 Wireless Receiver – Fatbat.uk
Logitech Unifying Vs Non-Unifying Receiver (software in description)
Logitech USB Unifying Receiver : Amazon.co.uk: Computers & Accessories
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, ...