Fast, Precise Measurement: digital laser distance meter, built in rechargeable long-endurance battery, measures distances with extreme high accuracy within long range, quickly displays the measurements on screen. Multiple Measuring Modes & BT: area, distance, volume, pythagoras, continuous(max/min value) measurement modes, meet different demands; BT function allows to transfer and store the data from the meter to a smart device via the app. Color Display & Mute Setting: large LCD backlit screen, clearly indicates power status and shows data value, ensures easy reading and recording even in darkness; the measure beep can be turned on or off with ease, as needed. Safe, Convenient Use: class II laser distance measure, less than 1mw power output, features safe, not dangerous; it will make laser output off after non-operation for 20s, automatically shut down when it is not used for 150s, saving energy.