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
Wireless Dongle Receiver Usb Adapter For Logitech Unifying Mouse Connect Mx M905 M950 M505 M510 M525 Etcm235, M280, M310, M310t - Pc Hardware Cables & Adapters - AliExpress
Logitech Unifying Usb Receiver Dongle 6 Devices Performance Keyboard Mouse New - Instrument Parts & Accessories - AliExpress
Logi Bolt USB Receiver for Multi-Computer / Device Use