Microsoft has introduced Wireless Mouse 4000, a portable mouse that is designed to go anywhere with BlueTrack Technology. Expected to be out in the market next September, the Wireless Mouse 4000 is designed for netbooks because of their increasing popularity. The new mouse connects to the PC via a tiny nano transceiver that sticks out less than a centimetre from the USB port. The Wireless Mouse 4000 will be available in hues of teal blue, berry pink and lime green as well as graphite and white.