Utilizing the procedure of scanning and marking from two sides, the product 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:+20degreesF to+120degreesF(-7degreesC to+49degreesC) Storage Temperature:-20degreesF to +150degreesF(-29degressC to+66degreesC)