The best mouse, especially if you have a problem with your hand. It has a large curve and the gap on the left helps the hand to be in a natural position without getting tired. The only downside is that the part where the batteries go doesn't help them stay in place

Sturdy construction, quiet, worth its money. It needs an on/off button because the batteries run out quickly. However, if you turn off the computer at night, they last quite a while. I've had it for a year and a half, it has fallen down and nothing happened! Very good!