Logitech Unifying Receiver for Connecting Multiple Devices
Amazon.com: Unifying Receiver for Mouse and Keyboard Compatible for Any Logitech Product That Display The Unifying Logo (Orange Star, Connects up to 6 Devices) 001 : Electronics
Bilster Technologies - LOST YOUR UNIFYING RECEIVER? Use this stand-alone USB Unifying receiver to replace a lost one. It's compatible with all Logitech Unifying products (look for Unifying logo displayed on compatible