Green topology, saving 50% energy than others at AC mode. Built-in super smart charger , 90% fully charged in 4 hours. Excellent microprocessor control guarantees high reliability. Boost and Buck AVR for voltage stabilization Off-mode auto charging Auto-restart while AC is recovering. Simulated sine wave. Cold start function. Built-in USB communication port and RJ-11 phone protection. Charging ability at low input voltage, 2 times more powerful than others.