... - voltage protection , output under-voltage,over -voltage, over load, short circuit protection. It features high stability , noise filtering ... 0.5%Output transient response±4% (100% load varies)Output wave crest ratio3: 1Output overload capacity120% ... D type connector (Optional part)EnvironmentTemperature: 0~40 , relative humidity: 95%(no condensation) UPS Low Frequency online type,single phase