Digital Mobile Charge40 24V to 12V Battery to BatteryDC Input Volts/Amps 24 Volts/20 AmpsDC Output Volts/Amps 12 Volts/40 AmpsDigital Mobile Charge40 is a breakthrough in battery-to-battery, on-the-water charging technology. Simply connect to the engine crank battery and your house electronic battery, allowing for up to 40 Amps per hour to be transferred to your house battery bank. Protects your engine battery while charging and conditioning your house battery bank, using its all-digital C boost-mode-charging technology. Meets a boat's demand for on-the-water power and charging for 12 or 24 Volt DC systems, allowing for radar, lighting, live wells and other DC systems to operate while managing and charging batteries when running your engine. WARNING This product can expose you to chemicals including di 2-ethylhexyl phthalate dehp which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.