Wireless Adapter Dongle Receiver Usb Adapter For Mouse Keyboard Connect 6 Device For Mx M905 M950 M505 M510 M525 Etc Laptop - Wireless Adapter - AliExpress
Amazon.com: SummitLink Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) B083J7DYDT : Electronics
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What is Unifying? - Logitech
Logitech Unifying Receiver for Connecting Multiple Devices