IOGEAR E7 Wireless Optical Mouse, Black (GME557R) 2.4 GHz wireless optical mouse - 33ft wireless range Customizable User Modes: Energy Saving mode; Illustrating mode; and Gaming mode E-tellitouch Technology: Mouse activated from sleep mode when barely touched by the hand DPI select button: 1000 / 1500 / 2000 User Mode Button automatically sets DPI and RPS optimized for Gaming, Precision or Power Saving Travel friendly - low profile nano receiver conveniently stores in battery compartment Ultra low power consumption - batteries last up to a year (Battery performance may vary depending on usage)