Material:Shell:100% plastic Features: 1. 2-in-1 Measure - This laser combines 40M laser measure with 5M tape measure,which brings extreme convenient to meet your different measurements with unit switch and IP54 proof.Press the Read button can switch laser freely for indoor and outdoor activities and Press the UNIT button for 2 seconds can switch the measurement unit M/In/Ft/Ft x In for your needs. 2.Continuous Measuring - In laser mode,continuous measuring is allowed to achieve by long press the READ button.The distance can be changed in real time when moving the laser,and counts successfully with single press on the READ button. You are free to enjoy getting all distance data up to 40M in this mode. 3.Self-calibration & High Accuracy - With 2mm accuracy on laser measuring,the laser provides self-calibration of distance with the front reference and the end reference about -9 ~ 9mm to give your a more accurate data.This small light-weight laser enables to change the measuring units of m/inch/feet/ftxin for various appliance. 4.Visible LCD Display & Auto-off - Press the READ button to turn on the high-definition LCD display,the backlight will go out when there is no operation for 20 seconds.Thoughtfully design of auto- shutdown when in idle status for 150s,which can be approved also by pressing the READ and UNIT button for 2s together.