FOIF RTS342 Total Station with Color Display and Trigger Key Description Easy Measure" trigger key mounted on the side of the instrument so the user doesn't lose sight of the target while measuring Illuminated colour display (QVGA) LED backlight alphanumerical keyboard Long reflectorless measuring distance reaches to 600 Meter Multiple data interface: Bluetooth, mini USB, RS-232C and SD card Onboard software and application programs to simplify and speed up field work Features: Dual Axis Compensator Easy Measure" trigger key on the side of the instrument Dual color screen (QVGA) Bluetooth, mini USB, RS-232C and SD card (x2) Batteries with over 8 hours of working time