Havis ChargeGuard Vehicle Power Management System automatically turns mobile equipment on when you start the motor. When you turn the motor off, the equipment stays on from 5 seconds to infinity depending on the selected time delay setting. Turns equipment off before pre-set time if voltage drops too low. Diagnostic LED helps trouble shoot voltage problems. Easy to install, no power needed for setup. Easy to set timeout delay switches. Choice of sensing modes: Automatic Detection, Battery Sensing (DC Rise), or Ignition. Override/test button provides 15 minutes of electronics power. Voltage diagnostic LED indicates status with color/blink codes. High (18V) and low (11V) voltage disconnect. Reserve polarity protection. MIL-STD-810F Compliant.