... 110V/220V voltage selector for charger can use both 110Vac and 220Vac.2,Efficiency: 85%-90%.3,Convection cooling eliminates ... , over voltage. over temperature, short circuit and reverse polarity protection.8,Led display charging states.9,Can modify max charging ... Constant power. Constant. Current. TrickleThe average life expectancy50000 Hours25 LED charging status indicator bus chargering for battery