Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying receiver - Wikipedia
Connecting a Logitech device to your Unifying Receiver (Windows and Mac) - YouTube
Re-Program your keyboard & mouse receiver with Logitech Connection Utility - YouTube
Connect multiple Logitech wireless devices using same USB receiver
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
Wireless Dongle Receiver Unifying Usb Adapter For Logitech Mouse Keyboard Connect 6 Device For Mx M905 M950 M505 M510 M525 Etc - Mice & Keyboards Accessories - AliExpress