Features: 1Support continuous measurement area volume measurement Pythagorean measurement addition and subtraction measurement area volume addition and subtraction peaks and self-calibration functions. 2This laser distance measurement has the function of automatically calculating area and volume. When using this laser measurement tool manual calculation is not required which improves work efficiency. 3Waterproof and dustproof dust will not affect the normal operation of the instrument and prevent water splashing from all directions from entering the instrument and causing damage. 4Easy to use only one button and one measurement key are required for operation. Without climbing stairs you can easily measure hard-to-reach areas such as high ceilings. 5Made of aluminium alloy material small body and compact mode fits in hand perfectly provides comfortable grip and gives you convenient operation. m/in/ft 3 kinds of units switch at any time. Specification: Item Type: Laser Distance MeterMaterial: Aluminium AlloyColor: As shown in the pictureProduct Size: Approx. 90x25x13mm / 3.54x0.98x0.51inWeight: Approx.60g/2.1ozBattery: Built-in 200mAh 3.7V lithium batteryMeasuring Range: 0.05-40mMeasuring Time: 0.1-3 secondsDustproof and Waterproof: IP54Electronic Level: 0-90 degrees 1 degree errorAutomatically Turn Off the Laser: 15 secondsAutomatic Shutdown: 45 secondsThe number of times that can be used after being fully charged: 3000 timesOperating Temperature Range: 0-40How to UseThe machine is automatically turned on. If you hold the C/OFF button for a long time it will turn off. When it is turned off press the ON button to turn it on. If there is no button operation for 25 seconds the backlight will be automatically turned off. If there is no button operation for 45 seconds it will automatically turn off. Package List: 1 x Laser Distance Meter1 x USB Cable1 x Lanyard1 x Chinese and English Instruction Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.