HIGH PRECISIONLaser measurement accuracy: +/- 2mm. Simple operation, press "MEAS" to turn on, press again to start laser measurement. Long press "MEAS" for about two seconds to perform continuous measurement, and the accurate distance can be read withinthe effective range while moving. Class II laser production<1mW power output. 3-in-1 MEASUREThis laser tape measure includes three mode- 131ft/40m laser measure , 16ft/5m tape measure, and 32ft/10m 90 Cross Line Laser measure. Long press the "Unit" button of this laser measuring tape to switch units freely between M / In / Ft. TAPE AUTOMATICALLY LOCKEDTape will automatically locked the position after pulled out, just press the grey button to auto rebound. The net weight of the tape measure: 262g, very light and convenient, only equivalent to the weight of a mobile phone,and you can easily carry it anywhere with a wrist strap and belt clip. LED BACKLIGHT SCREEN DATA STORAGEBigger LED-backlight screen helps you read laser ranging numbers clearly even in direct sunlight or dark environment; Store up to 20 measurements, laser tape measure auto-off to save energy. MULTI-FUNCTION MODE Digital laser tape measure for area measurement, volume measurement, Pythagorean measurement, double Pythagorean measurement and Cross Laser Line to satisfy your all needs.(Warm Reminder: The package does not include 2 AAA batteries) Package includes: a measuring instrument Products from LUOLV's store