Product Features This section rangefinder is designed for convenient and accurate measurement of distance area and volume and design. Measuring range 0.05 to 50 m the measurement accuracy up to +/-1.5 mm. Applicable to home decoration site surveying and mapping projects and other construction professionals. Features: Area volume calculation; Measure with Pythagorean theorem indirectly; Plus and minus function; Continuous measurement function; Maximum and minimum distance track; Lighting display multiple lines; Buzzer indication; Small size and comfortable hand feeling. Unite: mm / inches / feet Laser type: level 2 635nm of <lm W¯¯ Continuous measurement: Yes Area measurement: Yes Volume measurement: Yes Max / Min measurement display: Yes The backlight: Yes Buzzer indicator: Yes Water splash / dust: Yes Measurement storage: 20 Auto power off: 150s Single measurement of battery life 4000 times Storage temperature: -10~60'C (14~140'F) Operating temperature: 0 ~40'C (32~104' F) Battery: 2 x AAA (1.5V)