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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
I have lost the USB receiver for my wireless keyboard, can I purchase another USB receiver to work with the keyboard? - Quora
Connect multiple Logitech wireless devices using same USB receiver
Question - Logitech Keyboard with Generic Receiver? | Tom's Hardware Forum
Replacing Your Wireless Mouse / Keyboard Receiver - ComeauSoftware.com