The detector allows you to detect wires and metal profiles, as well as wooden structures behind walls or plasterboard panels: Detects live cables within 50mm Detects magnetic metals at a distance of 80 mm Detects non-magnetic (e.g. copper) metals at a distance of 60 mm Detects wooden elements at a distance of 20 mm The detector has an audio signal and three LEDs (green/orange/red) signaling the detection of a substance. Automatic shutdown, turns off after 5 minutes of inactivity The detector use a 9V (6F22) battery (not included) The battery lasts up to 6 hours