Wireless 2.4 GHz Logitech USB Unifying Receiver Compatible with six devices and Logitech Unifying Devices up to 10 meters: From the producer USB Unifying Receiver Six Devices and One Receiver With a single Unifying receiver, you can connect up to six compatible keyboards and mice to a single computer, eliminating the need for multiple USB receivers. Our smallest Unifying receiver is a tiny, leave-in receiver. It's so small you can ignore it.