LED lights indicate stud direction and location Detects live wire DETECTS WOOD & METAL STUDS: Up to 1-1/2" depth AC DETECTION DIRECTIONAL LED LIGHT INDICATORS: For visual guidance to stud location AUDIBLE ALERT: For clear notification of stud location CENTRE MARKING CHANNEL: For accurate stud markings AUTO-CALIBRATION: For continuously accurate readings ANGLE TOLERANCE: Reduces error when used at an angle Technical details Warranty period 1 year(s) Housing material Plastic Product colour Black, Yellow Auto calibration Yes Audible alarm(s) Yes Maximum detection depth (wood) 3.81 cm Maximum detection depth (steel) 3.81 cm Detectable materials Live cable, Metal, Wood Battery Number of batteries supported 2 Battery technology Alkaline Battery type AAA Power Power source type Battery