Havis ChargeGuard Auto Shut-off Timer, the latest version of the original automatic shutdown device, is more than an on/off timer for mobile electronics. It's a unique, easy-to-use, intelligent vehicle power management system that prevents dead batteries, protects mobile electronics from voltage anomalies, giving users peace of mind. With ChargeGuard Auto Shut-off Timer, equipment is always available, and you never have to remember to turn it on or off. ChargeGuard features a voltage diagnostic LED which indicates status with color/blink codes, easy installation, MIL-STD-810F compliant, protected terminals, easy open access door, selectable mode switch, and much more. Havis ChargeGuard protects your investment in vehicles, equipment and people.