Features:1) Offline / line interactive UPS2) From 350VA to 3,000VA3) LED or LCD available4) Wide input voltage range: 110V/220V/230V/240V?5%5) Wide input frequency range: 45-55+/-1Hz or 55-65?Hz6) Stabilized output voltage: 110V/220V/230V/240V?0%7) Output frequency: in AC mode, track AC; in battery mode, 50?.5Hz or 60?.5Hz8) Full AVR9) Wave form: sine wave (mains); square wave (inverter)10) Transfer time: 2-7ms11) Battery: sealed lead-acid maintenance-free battery12) Full protection: short-circuit protection, lighting and surge protection, over / low voltage protection, overload protection, etc) 13) Microprocessor-based digital control (LCD)14) Automatically distinguishing output frequency(LCD)15) Automatically charging battery in UPS off mode16) Self-diagnosis on startup17) Cold start 18) Automatically cut off when no load connected19) Intelligent battery management20) Battery replaceable without interruption 21) RS232/ RJ11/RJ45/USB for your choice22) Many front panels and colors for your choice Standard export package producing area:China