... adjustable 2,LCD display inverter 3,pure sine wave inverter 4,super charger inside 5,CE ,SONCAP solar system use solar inverter ups 2500w Main features ... Sine waveCrest Factor3:'1Output FrequencyAuto Select for 50/60Hz,47Hz ~55Hz for 50Hz nominal,56Hz ~ 65Hz for 60Hz nominal(Synchronized to Mains)Regulation ... ;3000W/23.5kgSize(mm)LxWxH630*219*179Weight(Kg)4000W/35kg ;5000W/38kg ;6000W/40kg