FreeKB - Logitech Resolve "There is no Unifying receiver plugged into your computer"
Logitech Unifying Receiver for Connecting Multiple Devices
Logitech Unifying USB Receiver for Wireless Mouse and Keyboard, 6-Device (910-005235) | Staples
Logitech Unifying USB Receiver - EveryMarket
Logitech Usb Unifying Receiver (910-005236) Black | Techinn
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) - Walmart.com