You get precise cursor control wherever you want to use your trackball mouse from Logitech. Hard tables, comfy sofas, and lumpy beds are all no problem for the M570. Youve got a different kind of comfort thanks to a leave in wireless receiver, long battery life and precise cursor control that lets you work and play wherever you want. Includes Logitech Wireless Trackball M570, Mouse Ware Software, User Guide on CD-ROM, USB. Laser. 3 buttons. Programmable buttons. Scroll wheel. 4 way scroll. Approximately 18 months battery life. Batteries required 1 x AA batteries not included. Manufacturers 3 year guarantee.