Logitech USB Unifying Receiver 58 H x 38 W x 14 D Black 910 005235 - Office Depot
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
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying Vs Non-Unifying Receiver (software in description) - YouTube
Step-by-Step Guide: Adding a New Device to Logitech Unifying Receiver - YouTube