... suddenly.3.digital control Three stage charger, improve battery life4.with Battery Selector for charge of different battery5.Power saver Function ... ,Boost voltage 14-15.5V selectable for different Battery. The others are multipleCharger Current12-75AMP difference for ... / Over load trip / Power Saver onAudible AlarmBattery Low,Battery High,Over Temp. Over load,Fail,Over chargeOptionalRS232 Communication ...