These Deltran Battery Tender Plus systems are designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers. Features include: * Quick-connect harness for hard-to-reach areas * Temperature compensated to ensure optimum voltage according to ambient temperature * Automatic switching from full charge to floating mode * Reverse polarity protection * Complete 3-step charging program (Bulk Charge, Absorption Mode, Float Mode) * 10-year warranty"