Sabrent Ergonomic 2.4GHz Wireless Rechargeable Mouse with 4D Function (MS-WRCH) Rechargeable Li-battery (built in) Ergonomic Design For Maximum Comfort Advanced High Precision Optical Sensor 4D Directional Control Scroll Wheel and 2 Side Keys offering Windows Access and Also DPI Control Multi Media Control Mode with Next Song, Pause/Play, Volume Up/Down