USB Unifying Receiver - USB Dongle - For Logitech Mouse + Keyboard unify | eBay
Logitech M510 Wireless Mouse, 2.4 GHz with USB Unifying Receiver, 1000 DPI Laser-Grade Tracking, 7-Buttons, 24-Months Battery Life, PC / Mac / Laptop - Black : 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
ltunify | Tool for working with Logitech Unifying receivers and devices on openSUSE – CubicleNate's Techpad
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Replacement Unifying Receiver for Logitech Wireless Mouse/Keyboard USB Dongle | eBay
Unifying USB Wireless Receiver for Logitech Mice M325 M310 M305 M510 M185 | eBay
Zone Wireless Plus Unifying + Audio Receiver
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Logitech M510 Wireless Laser Mouse for PC/MAC with Unifying Receiver - Gray - General Maintenance & Diagnostics Ltd