Features : Stud finder detects studs through walls up to 19mm. Rubber overmould provides comfort and grip when using hand held. Hanging pin fastens unit to the wall for hands free operation. Target cones enhance visibility of line at long distances. Auto levelling laser, so no manual levelling required. Storage case protects the laser during storage and transport. Specifications : Accuracy 1 mm/m. Class 2. Line length 2.4 - 3.7 m. Output <1 MW Alkaline battery 9V.