MULTIPLE MEASUREMENT FEATURES Measurement of simple and continuous distances, area, volume, Pythagoras for height and triangular area; Addition and subtraction function. HIGH VISIBILITY AND PRECISION Laser: Class 2, <1mW. The powerful Measure laser easily projects a bright, sharp red line. With high accuracy of 1.5mm inch at 165 feet, laser measure powered by 3AAA(NOT included). Ideal for the installation of photo carpentry, door, window or furniture, hanging wallpaper, etc. HIGH PROTECTION GRADE The laser measurement achieves IP54 degree of protection (shockproof, dustproof, shockproof, wearproof, shockproof). The durable and high quality shockproof case provides 4 feet. It is compact and lightweight for easy handling POWERFUL DATA STORAGE The 50 group data memory gives you better contrast visibility in many measurement operations. Units in feet/meters/inches, large 4-line backlit LCD display for easy reading. WHAT YOU GET Laser measuring device 165 feet; User's Guide; Packing box