Wireless 2.4 GHz,Optical technology Comfortable, ergonomic design, 3-buttons, Scroll wheel With NANO receiver in the battery slot, achieving wireless operation Smart power saving design Suitable for use in office Type: 2.4G Wireless optical mouse Connectivity Technology: Wireless, USB DPI: 1600DPI Rate of return: 250Hz Effective distance: 20m Voltage: 1.5V Current: 11mA