... Operation Distance, Ergonomic Design, High Accuracy, High Quality, Modern Design....2.4GHz wireless transmission up to 10 meters operating distance.No need ... .Automatic Power off (APO)Intelligent Power Saving (IPS)Powered by 2 x AAA Alkaline battery. (battery NOT included)With an ON ... : Windows 98, 2000, ME, XP, Vista, Win 7 and morePower: 2 x AAA battery (not included)Color: WhiteItem size: 112 * 57 ...