The tiny Logitech unifying receiver stays in your computer so your wireless mouse is always connected & ready to use. It connects up to six unifying devices to your computer, so you can easily add a compatible mouse or keyboard without sacrificing precious USB ports. Advanced 2.4 GHz wireless technology provides a powerful, reliable connection up to 33 ft. (10 meters) away with virtually no delays or dropouts. For Use With: Logitech Unifying Devices; Accessory Type: Unifying USB Receiver; Connector / Port / Interface: USB; Material(s): Plastic.