SafetyBoost™ is a patented backup battery system designed to provide electrical power to start engines in the event of a primary battery failure. This system can be added to any existing circuit. An important feature of SafetyBoost™ is an automatic disengage system when not in use. This circuitry prevents discharge of the SafetyBoost™ battery, while at the same time allowing the backup battery trickle charge, if necessary, to maintain peak capacity. The SafetyBoost™ battery engages when the remote is activated. You will know the unit is working when the light on the unit blinks at that time.