... not only a power inverter, it is a 12v battery charger and an automatic UPS UPS =(Uninterruptible Power System ) ... protection.3. Inverter and charger indicator: Fully charged, Public Power, Inverter fault.4. Dual Switch (Inverter, Charger) supporting battery deep discharge5. ... power off.6. Two power switch controller(inverter switch, charger switch), so that it can support battery deep discharge. ...