Logitech Unifying Receiver up to 11 Devices USB Dongle for Wireless Kb and Mouse | eBay
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Solaar' Lets You Manage Logitech's Unifying Receiver on Linux - OMG! Ubuntu
Amazon.com: New Logitech Unifying USB Receiver for Mouse MX M905 M950 M505 M510 M525 M305 M310 M315 M325 M345 M705 M215
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Amazon.com: Logitech Unifying Receiver, 2.4 GHz Wireless Technology, USB Plug Compatible with all Logitech Unifying Devices like Wireless Mouse and Keyboard, PC / Mac / Laptop - Black