Advanced microprocessor controlled 3 stage charging Advanced microprocessor controlled 3 stage charging mode - Boost / Absorption/ Float Zero Voltage start - Able to commence charging a completely flat battery Soft Start function with selectable charging amperage output (start-up only) Alligator clamp and ring terminal battery connectors Over charge, short circuit and over temperature protections. Reverse polarity protection with warning LED light and audible buzzer (only operable when connected battery exceeds 2 Volts) Charging status indicators Selectable battery types - Lead Acid, Calcium