Not enough room to mouse? That's not a problem with the SlimBlade(TM) Trackball Mouse. The trackball gives you control even when there's no room to move a mouse.The Kensington SlimBlade(TM) Trackball Mouse works where other travel mice can't. The trackball gives you control even when there's no room to move a mouse, then switches to mouse mode with the push of a button. Bluetooth connectivity offers up to 30 feet of range and doesn't use up a USB port. Plus, you'll never worry about turning your mouse on or off again -- this mouse goes into sleep mode when your notebook does.