EV Human Ergonomic Mouse will give you a more comfortable felling by using. The ergonomically-designed thumb rests and grips fit the contour of your palm for maximum comfort. Comfortable 75° vertical angle can relax your hand and arm even when use for long time. Special designed place for little finger can reduce friction on table. 500mAh inlay polymer battery for higher compatibility and practical applicability. Directly use without installing any software. Light weight with Teflon durable feet for free use. Laser stable transmission provide you more precise positioning.