Amazon.com: Logitech C-U0007 Unifying Receiver for Mouse and Keyboard Works with Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) (C-U0007) : Electronics
How to Pair logitech Mouse/Keyboard with Other non-Unifying Receiver (for PC) - YouTube
Wireless Dongle Receiver Unifying USB Adapter for logitech Mouse Keyboard Connect 6 Device for MX M905 M950 M505 M510 M525 Etc|Mice| - AliExpress
How to Pair Mouse & Keyboard with Logitech Unifying Receiver
What is Unifying? - Logitech
Logitech Unifying Receiver for Connecting Multiple Devices