DOOR FRAME METAL DETECTOR REAL SAFE- QE - 2 SPECIFICATION : Low cost walk through for weapon detectionQuick installation, no training requiredFrame includes walkthrough foot rampAutomatic zero adjustmentDual power mains / battery, in built chargerIgnores metal outside frame9 levels of sensitivity and 9 levels of alarm10 step bar - graph indicator3 level LED indicator for low, medium and high level of alarmPiezoelectric beeper for indication of metalOptical sensors used to avoid external disturbancesWALK and STOP indicators to regulate trafficDetects all metals, alloys and ferritesLow field strength, no effect on pacemakers and magnetic mediaSMPS power supply, works from 90 Volt to 270 Volt with full function battery backup