1, DSP, Microprocessor Controlled with the latest IGBTTechnology 2,High Frequency 60Hz 3,USB and SNMP Card included with soft three-phase digital UPS1,Output Frequency Range: 50Hz, +/-5% 2,Input Frequency Range: 40~70Hz 3,Input Voltage Range: 204~520VACFeatures:1,The strong overload ability and impact resistance ability2,Three-phase automatic balance3,Higher stability of the system