... (THD): pure sine wave(<3%)Frequency: 60Hz ±0.3% or 50Hz ±0.3% ProtectionsLow voltage alarm:10.2~10.8Vdc or ... voltage: 100V, 110V, 120V, 220V, 230V, 240V3.Frequency: 50Hz, 60Hz, 50Hz/60Hz(having frequency switch)4.Socket types: USA, Australia, universal, UK, France ...