1.Advanced Battery Management 2.Automatic charging in UPS off mode 3.Smart RS-232 communication port 4 ... .Optional SNMP card Key Features1.Three phase in, one phase out2.Microprocessor control3.100% unbalance protection design4. ... unit>85% Transfer Time0ms Panel Indication LCDInput,oupt,battery voltage,frequency,load rate,UPS state, temperature LEDMain input , bypass,Inverter, ...