Experience a better computer mouse with the Logitech M570 Wireless Trackball Mouse in gray (910-003283). Forget about making a better mousetrap, Logitech has invented a better mouse. The M570 Wireless Trackball Mouse features a sculpted trackball that supports your hand and lets you rest your arm. With the trackball locked into place, you dont have to move your arm to move the cursor so there is less cramping and the supportive shape will feel completely natural almost instantly. By using a Logitech Unifying receiver (in your USB) you can add compatible devices, like this wireless mouse, as you need them. One small battery will last 18 months; so long youll almost forget you need one. 3 year limited warranty.