DTC's OFFENDER ALERT PASSIVE SCAN FEATURES AND SPECIFICATIONS The DTC Offender Alert Passive Scan is a portable scanning security device that uses the Earth?s magnetic fields to detect potential security threats. The Offender Alert Passive Scan is the only product of its kind that uses passive scanning. Traditional detectors use X-ray (radiation) imaging -the same type of technology that can have harmful effects after prolonged exposure; the Offender Alert Passive Scan eliminates any exposure to students. When students step through the Offender Alert Passive Scan, sensors embedded within the aluminum frame alert security personnel to the level of threat with color-coded LED lights and an audible buzz. The Offender Alert Passive Scan also can link with a computer to give an instant view, using numbers or colors, of the threat area, which can then be transmitted to a handheld device for ease of use, threat tracking and neutralizing. http://www.defensetechnologycorporation.com/