The Kensington Orbit for Macintosh computers, looks like a mouse, feels like a mouse, but it's a trackball. This 9-pin serial interface (Macintosh) trackball is clearly one of the hottest new input devices on the market. Unlike other accessories that put a strain on your body after hours of use, this trackball gives your hands and arms a rest. Designed with Kensington's Hand-Hugging Comfort, the Orbit immediately transforms you to a comfort zone that blows away the competition. It's designed to support the natural angle of your hand and wrist, so you're able to work in a more comfortable and productive position. Plus, the unique shape of the Orbit is perfect for both left and right-handed users.