CTEK (56-676) SmartPass 80 Amp Energy Management Unit Converts a 110/230V charger with one output into a unit that serves both the service and starter battery, eliminating the need for units with multiple outputs Has a sensor which senses the battery temperature and reduces charge current at high battery temperatures Built-in battery watch technology to make full use of the majority of energy produced Combining the use of the D250S Dual ensures optimal battery charging by managing energy transfer Splash and dust proof makes it ideal for all environments