Stud finder and laser line level. Detects wood and metal studs up to 1 1/2 in. (3.81 cm). Continuous live wire detection for safety. Laser line level adjusts for plumb or level with 3 vials for accuracy. Projects up to 6 m (20 ft.). Temporarily adheres to surfaces with removable adhesive tabs. Requires one 9 V and two AAA batteries (not included).