JDT-03 uses electronic signals to locate the exact position of studs, ceiling joist AC wires and metal through drywall, concrete and other common wall materials. Once the edge of a stud has been detected, JDT-03 emits audio and visual signals (LED Display) that allow you to easily pinpoint its center position. Utilizing the procedure of scanning and marking from two sides, JDT-03 will find the center of wood or metal studs or live wires through 3/4 inch surfaces within 1/8 inch accuracy. Battery Life　　　　 : 1 year with normal use Water Resistance　　 : Water resistant, but not waterproof. Operating Temperature : +20°F to + 120°F(-7°C to +49°C) Storage Temperature　: -20°F to + 150°F(-29°C to +66°C) Dimension: (L?W?H): 223?92?45mm Weight (with battery): 250g