... customers' required, or we can make 110V/220V voltage selector for charger can use both 110Vac and 220Vac.2,Efficiency: 85 ... %-90%.3,Convection cooling eliminates the need for a cooling fan.4,Automatic,Advanced ,high frequency, switch mode ... average life expectancy50000 Hours25 Small size, low weight battery chargers for motorbike and e-bike