Amazon.com: Logitech 920003051 K270 Wireless Keyboard, USB Unifying Receiver, Black : Electronics
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
Logitech wireless keyboard + unifying nano receiver (and free mouse) - computers - by owner - electronics sale -...
Logitech Unifying receiver - Wikipedia
What is Unifying? - Logitech
Logitech K750 Solar White Wireless Keyboard for Mac + Unifying USB Dongle | eBay