The contoured, natural (46.7 degrees) tilt positions the wrist neutrally and eliminates pressure on soft tissue. It provides complete support for smoother movement of larger muscle groups. Fully equipped mouse with scroll wheel, left, right, forward, backward, and DPI buttons (800/1000/1200/1600). Simply plug in the nano receiver for a wireless connection of up to 20 meters. It alerts you when it's time to change the battery, so you are never caught off guard. One AA battery lasts up to a year. The nano receiver can be conveniently stored inside the mouse when not in use.