Small size: 112.50LX63.35WX35.95H(mm) Voltage: DC 5V 100mA High precision with 1000dpi MODEL: MS111 DELL D PPID: CN-011D3V USB Interface Optical Three-button design Connectivity Technology : Wireless - RF Wireless Receiver : USB wireless receiver Connection Type : USB 2.0 Movement Detection : Optical Power Supply :1 x AA Battery Intelligent connectivity, noneed to code, plug and play Ergonomically designed, comfort grip 800 dpi/1600dpi, cursor speed adjustable Power switch,Scrolling Wheel Featur