Logitech USB Unifying Receiver 58 H x 38 W x 14 D Black 910 005235 - Office Depot
Zone Wireless Plus Unifying + Audio Receiver
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
Pairing two Logitech Devices with the same USB Receiver (Windows 10) - YouTube