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
Logitech Unifying Receiver for Connecting Multiple Devices
Original Logitech Unifying Mirco Dongle Empfänger USB für Tastatur K400rK400plus | eBay
What is a Logitech Unifying receiver and how can you benefit from it? - Newcom