Security inspection: airport, prison, customs, railway, stations etc. MD-S1 (HIGH PERFORMANCE HAND HELD METAL DETECTOR)FEATUREVery High SensitivityDetection of both Magnetic and Non-Magnetic MetalsOptical, Acoustical and Vibration Alarm Long Battery LifeVery High Reliability Easy to Use Self-Calibrating Fast Battery Charger(4~5 hours, option) APPLICATION Security inspection: airport, prison, ...