1.5 Amp Three Stage Onboard Battery Charger Maintainer with LED Indicator; Equipped with overload protection, short circuit protection, and reverse polarity protection Three-stage fully automatic charging protects and prolongs battery life Auto on/off trickle charging stage keeps 12 volt batteries fully charged without overcharging Equipped with overload protection, short circuit protection, and reverse polarity protection for added safety Also great for maintaining batteries while in storage Has LED charge indicators