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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
What is Unifying? - Logitech
Logi Bolt USB Receiver for Multi-Computer / Device Use
Logitech USB Unifying Receiver : Amazon.co.uk: Computers & Accessories