Original 3mm Unifying Receiver For Wireless Mouse And Keyboard Logi-tech M185 M280 M545 Mk260 270 Can Connect Up To Six Devices - Mouse - AliExpress
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 : Electronics
How to Pair LOGITECH Performance MX mouse with non-Unifying Receiver (for PC) - YouTube
How to Pair Logitech Mouse /Keyboard with Unifying Receiver - YouTube