... Computer Programed Control technology used2. Wide input voltage3. High efficiency : ≥ 90%4. Protection against over voltage , low voltage , overload , over temperature ... ,Protection Protection Over voltage,Low voltage,Overload,Over temperature,Delay time Input voltage AC150~270VOutput voltage 220V± ... 50/60Hz Phase Single Phase Efferency ≥90% Ambient temperature -15°C~45°C Relative humidity<95% Waveform ...