New Unopened - The Microsoft Comfort Mouse 4500 in Lochness Gray is a wired USB mouse with a maximum DPI of 1000 and five buttons. It features BlueTrack technology and a grip design for comfortable use. The mouse is 4.60 inches long, 2.70 inches wide, and 1.70 inches high. The model number is 4FD-00025 and it is made by Microsoft.