NEW Logitech Unifying USB Receiver for Performance Mouse MX - Newegg.com
Wireless Dongle Receiver USB Adapter For Logitech Mouse Keyboard for M280 M320 M325 M330 M545 Dongle Receiver for Computer - AliExpress
Logitech Unifying receiver - Wikipedia
Logitech Cordless Mouse and Keyboard Receiver P/N 831168-0000 Model C-BO17 | eBay
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