[Muted Click]Upgraded optical sensor, smooth and fast response offer you a better online time. The Left and right button silent design makes you work or play in a quiet environment, and wont disturb others when you are at home or in the office. [Ergonomic Mouse]Fits hands curve, arc design. Takes small space after rotate, lightweight and mini (size: 4.6"*2.3"*0.3") compact design occupies less space of your desk. A perfect fit for your hand and your mobile lifestyle