The Sine Wave Inverter has well placed thermal protection sensors, The aluminum alloy casing with a few ripples, Unique vents and also a built-in FAN which comes ON under NO any loads or when the Inverter becomes Hot Once Powerred. The LCD smart screen will display the DC input, AC output voltage battery capacity and power load.
Isolated Voltage Protects Perfectly for your device from Over-voltage, Under-voltage, Overheat, Overload, Reverse Polarity, Short circuit. It will not drain your battery dry because of an under-voltage protection point. The Inverter does automatically sense overload condition and shuts down AC power when the load exceeds 600W. The ON-OFF switch only works for the 3-prong plugs.
The 12V cigarette lighter plug is spring-loaded and fits snugly into the receptacle. You cannot get 400 watts from 12 volt cigarette lighter plug, needs dedicated connection cables for car battery. If you're going to be plugging this into car cigarette lighter, you should keep the wattage under 150, since that is what most car fuses are set for.