LED display Micro processor-based digital control Boost and buck AVR for voltage stabilization Frequency adaptive Humanized alarm system Automatically diagnose when starts Auto restart while AC is recovering Simulated sine wave output Short circuit and over discharged protection Automatically charging battery at UPS off mode Shutdown when no load connected at battery mode(Inclusing Software) Generator compatible-Bypass function Specifications Capacity 1500VA/900W Frequecny 50/60Hz+1%(Auto Sensing) Waveform Stepped sine wave Transfer Time Typical 4ms-6ms Battery recharge time 4- 5 hours Number of batteries 2x12V/7.0AH