Length measurement: Continuous measurements, any size, height, width and depth can be added or subtracted. Volume measurement: This unit can automatically calculate the volume after measuring the length, width and height. Area Measurement: This unit can automatically calculate the area after measuring its length and width. Pythagoras Measurement: This device can automatically calculate the third side of the triangle according to the Pythagoras theorem. Measuring Deviation: ± 1.5 mm Laser Type: 635 mm 1mW / ll Battery Type: AAA Alkaline Battery (2x1.5V) Product Dimensions: 115x52x28mm