Six Channels Wireless Mouse USB Receiver for Logitech Unifying M235 M280 M310 M320 - Newegg.com
Wireless Dongle Receiver USB Adapter For Logitech Mouse Keyboard for M280 M320 M325 M330 M545 Dongle Receiver for Computer| | - AliExpress
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