Description About SW-40B/50B/60B using The Rangefinder can be widely used in construction and industries, especially in large areas such as rooms, apartments, buildings, real estates, factories, etc . Specifications 1The maximum measuring range:40M.50M.60M. 2Measuring accuracy: 2mm 3Laser cla: Cla 2 4Laser type:630-670nm,1mW 5Auto laser off: 20 seconds 6Auto instrument off: 150 seconds 7Storage temperature: -20-60 degree 8Operating temperature: 0-40 degree 9Area, Volume Measurement: Yes 10Indirect Pythagorean theorem: Yes 11Min./max./value: Yes 12Auto calibration functionyes 13Storage humidity20%-80% RH 14Battery: 3.7V 850mAh lithium battery 15Minimum display unit:0.001m 16Charge and discharge times: 500 times 17Charging specification: DC 5V500mA Type-C USB interface 18Full power work times8000times 19Screen: Segmented LCD 20Size: 100.3*33.4*18.3mm 21Shell material: aluminum alloy Include package 1x laserrangefinder x user manual 1x Portable bag 1x Charging cable