2.4 GHz wireless optical mouse with USB receiver. Optical mouse with 5 buttons (page up & page down). Working distance approximately 8M. Powered by 2 AAA batteries with ON/OFF switch. Adjustable optical sensor from 800 dpi to 1600 dpi. Nano receiver. In-mouse design for convenient carrying. No driver needed, simply plug & play. Supports Windows ME, 2000, 2003 Server, XP and Vista