Contoured, natural (46.7°) slope keeps the wrist in a neutral handshake position, eliminating soft tissue compression. Extended lip for the little finger provides complete support for smoother, larger muscle group movement. Fully-featured mouse with scroll wheel, left, right, forward, back, and DPI (800\/1000\/1200\/1600) buttons. Simply plug in the nano receiver for plug and play wireless connectivity up to 65.61 ft. Low battery indicator let's you know when it's time to change the battery, so you're never caught off guard. One AA battery lasts up to a year. Nano receiver conveniently stores inside mouse when not in use.