· 3 IN 1 UNIT- Functions as a battery charger, maintainer and trickle charger· COMPATIBLITY - Compatible with any 6V and 12V AGM, GEL, or WET automotive or marine battery· FULLY AUTOMATIC - High frequency charging restores lost batteryperformance for stronger engine starts and extended battery life· PEACE OF MIND - Built-in circuit protection guards against overcharging, reverse polarity or short circuit.· HANGING HOOK - For ease of use in tight spaces