... .)92%ProtectionBat low alarm<10.5V <22.5VOver loadShut off output voltage, re-power on to recoverBAT. Polarity ReverseAutomatic ... protection of reverseOver voltage>15V >29.5VOver TemperatureShut off output voltageOutput shortShut off output voltage, re-power on to recoverEnvironmentWorking ... output short-circuit; against overload, and when you throw off its load, it will turn on the unit automatically ...