... ,no environmental protect,no maintenance,3.GMT power inverter (with charger UPS )specification details: ModelCA2000SpecificationINPUT DC12V, OUTPUT AC220VINPUTInput ... shutdown10±1V Over voltage shutdown15±1VStart blue light, working with blue light and green lightUndervoltage / Overvoltage: LED red ... , Travel, Camping, Medical and emergency4. Accessories 5.Application portable inverter with charger