For Logitech Unifying USB Receiver Dongle 6 Devices Performance Keyboard Mouse | eBay
Brand new - Logitech Unifying Receiver for keyboard & mouse | eBay
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