The mouse has got a radius of 67.5 mm and it is 8 mm thick at the maximum. It is a wireless optical sensor mouse with three programmable buttons.To move the mouse you can simply use your thumb and your little finger leaning on the external ring, while the buttons are pressed by the other fingers.All the hardware and the rechargeable battery are centrally positioned. Owing to its symmetrical shape it can be used either by right-handers or by left handers. Its case, similar to a CD-case, allows also to recharge batteries. The transparent “e” will suddenly blink when any e-mail arrive.It is a “pocket mouse”