Solid state two color LED indicates stage of charger; a quick connect harness for use in hard to reach areas Perfect for all lead-acid, flooded or sealed maintenance free batteries (AGM and gel cell) Complete 4-step charging program (initialization, bulk charge, absorption mode and float mode) that maintains batteries at full charge without overcharging via its 4-step charging system Automatically switches to float/maintenance mode voltage after fully charging the battery Temperature compensated to ensure optimum charge voltage according to ambient temperature, and spark proof and reverse polarity protected; 10-year limited warranty