... & LED alarm,Harmless to human body alkthrough Metal Detector ZLZX-2101II (6 detecting zones) Technical parameterElectric current ... exclude the coin, key, belt.Sound Alarm: 1-25s alarm time, 255 different sound volume for ... Through Metal Detector ZLXZ-2101II is designed for Exhibition center, Electronic Factory, Bank, Prison, Government office, Casino etc. walk through metal detector scanner ...