Compact design with Windows CE 7.0 operating system 3.5" colour TFT LCD (320 x 240 dots) touch screen, transflective sunlight readable display Professional onboard software: FOIF Fieldgenius,FOIF Survey Long reflectorless measuring distance reaches to 600m(R600) or 1000m(R1000) Illuminated keyboard with light sensor, turn on in dark surroundings automatically Multiple data interfaces,USB host, USB slave, RS-232C or Bluetooth(optional) connections are available Smart battery managing system, display battery life in real-time Guide light system(optional) for fast stake out measurement