Key Features : Simple One Button Operations to instantly measure distance between two Object Bright laser for easy targeting even at longer distance Quick Calculation of area ( Square Feet/Meter ) and Volume Easy addition and Subtraction function Pythagoras Function indirectly Measure height via two other measurement Stores up to five measurement results Battery Life of 3000 Measurement with automatic shut off feature Two Line Display with display hold Laser Class : 2 Laser Type : 635 nm , <1 mW Protection Class : IP 40 Automatic Laser Off : After 90 Seconds Automatic Power Off : After 180 Seconds Safety : IEC Standard No. 61010-1:2001 , EN60825-1:2007 (Class II)