Logitech Standalone USB Unifying Receiver (910-005235)
Logitech Unifying Receiver 1 to 6 Devices USB Dongle for Wireless Keyboard Mouse (White Envelope) - Walmart.com
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
Amazon.com: Logitech USB Unifying Receiver - Black : Electronics
Logitech Unifying Receiver for Connecting Multiple Devices
What Is A Logitech Unifying Receiver And How Can You Benefit From It?
Dongle USB Receiver for Logitech Unifying Wireless Solar Keyboard K750 K800 K520 | eBay