Detecting Method: Magnetism induction Detecting Sensitivity: High – FeΦ0.5mm-0.8mm; Low – 0.9-1.2mm Sensing levels: High & Low Detecting Width: 50mm Detecting Height: 10-30mm Alarm Methods: Voice and Sound Power input: 6F22—9V Battery Power Consumption: Stand-by <5mA，Alarming <30mA Unit size: 190×52×42mm(L×W×H) Unit weight: 280 Grams