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 Mouse /Keyboard with Unifying Receiver - YouTube
Logitech Unifying wireless technology: Q&A for the IT Manager or Business Manager
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Mouse - Pairing with Original Non-Unifying Receiver - YouTube