The 021-0128 Battery Tender Plus is a 1.25 amp battery charger designed to fully charge a battery and maintain it at proper storage voltage without the damaging effects caused by trickle chargers. Included with the Battery Tender Plus, is a quick connect harness for hard to reach areas. Temperature compensated to ensure optimum charge voltage according to ambient temperature. Automatically switches from full charge to float charging mode. The Battery Tender Plus at 1.25 amps will charge as fast or faster than any 3 amp charger available. Reverse Polarity Protection to ensure user safety. Complete 3-step charging program (Bulk Charge, Absorption Mode, Float Mode). 10 year Warranty!12 V 1.25 A (replaces 021-0069) BATTERY TENDER PLUS90-132 VAC Input Standard.Ring Terminal and Alligator Clip Harnesses with BLACK (12V) or WHITE (6V) Quick Disconnect Included.