Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying receiver - Wikipedia
Ask a Swiss: How to connect a non-Unifying Logitech keyboard & mouse to a new dongle
Amazon.com: Logitech New Unifying USB Receiver for Mouse Keyboard M515 M570 M600 N305 MK330 MK520 MK710 MK605 : Electronics
Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: 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 : Electronics
How to Pair Logitech M330 with Non-Unifying Receiver (for PC only) - YouTube