Logitech Unifying Receiver for Connecting Multiple Devices
Logitech K270 Wireless Keyboard with Unifying Receiver
Solved: XPS8940 Logitech Unifying USB receiver cannot be detected - Page 2 - Dell Community
Amazon.com: Logitech USB 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
Why you should really, really update your Logitech wireless dongle - The Verge
Amazon.com: Logitech USB 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
Best Buy: Logitech USB Unifying Receiver 910-005235