... has 255 degree sensitivity level, threepatterns: High, middle, Low for different requirements. Preset the metal size, weight, volume, location ... exclude the coin, key, belt.Sound Alarm: 1-25s alarm time, 255 different sound volume for chooseLED light alarm: LED bar ... magnetic floppy, recording tapes, etc. For option : Battery backup, up to 8 hours For option : Network supportApplication The 2101A2 is ...