Magnum Energy MM1212 MM Series 1200W 12VDC Modified Sine Inverter/70 Amp PFC Charger, Standard transfer relay, Versatile mounting, Fan cooled, Low battery protection, High battery protection, Current overload protection, Convenient switches Attractive styling: The modern, hourglass case, paired with the die cast aluminum base combines form with function, creating an attractive unit that uses its base as a heat sink for superior high temperature operation Standard transfer relay: The standard 20 amp transfer relay will pass AC power through the inverter when using grid or generator power Fan cooled: The MM Series is fan cooled, enabling the unit to work well in confined spaces. If the inverter does exceed its temperature limits, it will automatically shut down and then restart when it cools down Low battery protection: If your battery voltage goes below the cut-out setting the MM Series will automatically shut down, saving your batteries Safe and reliable: The MM Series is ETL Listed to the stringent requirements of UL/cUL 458 and CSA C22.2 #107.1-01 for mobile use