High frequency and true double conversion DSP digital control technology Input power factor correction (PFC) Wide input voltage range Output power factor 1.0 Cold start Auto sensing frequency ECO mode operation for energy saving Selectable output voltage via LCD 50Hz/60Hz frequency conversion mode available Built in output isolation transformer Selectable battery low voltage via LCD Power-on self test Advanced battery management (ABM) Short circuit and overload protection Automatic charging battery in OFF mode Fan speed auto control when loads varies Standard RS232 communication port and RJ45 protection Optional USB/SNMP communication port Optional emergency power off (EPO) Optional extension battery bank Optional manual bypass Optional N+X redundancy parallel