High frequency and true double-conversion DSP (Digital Signal Processors) technology Input power factor correction (PFC) Wide input voltage range (110V ~ 300V) Output power factor 0.9 Cold start Auto sensing frequency ECO mode operation for energy saving Selectable output voltage via LCD Output bypass settable via LCD Power-on self test Advanced battery management (ABM) Short circuit and overload protection Automatic charging in OFF mode Auto control fan speed when loads varies Standard RS232 communication port and RJ45 protection Optional USB / SNMP communication port Optional emergency power off (EPO) Optional extension battery bank