The tiny Logitech® unifying receiver stays in your computer so your wireless mouse is always connected and 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; OEM/Compatible: Compatible; Accessory Type: Unifying USB Receiver; Connector/Port/Interface: USB.