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Logitech Unifying Receiver
Amazon.com: Logitech USB Unifying Receiver - 2 Pack : Electronics
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
USB Unifying Receiver for Logitech Mouse and Keyboard 73257010740 | eBay