Compact SizeLine Interactive DesignFully Digitized Microprocessor ControlAuto Voltage Regulation (AVR)50/60 Hz Frequency (Auto-Sensing)Generator CompatibleCold Start Function (DC Power On)Advanced Battery Management (ABM Technology)Advanced Green Mode FunctionLightning and Surge ProtectionShort Circuit and Overload ProtectionEMI/RFI Noise FilterAutomatic Charging When UPS is OffAudible Alarm & LED Power Status DisplaySmart RS-232/USB Communication Port*Network/Tel/Modem/Fax Spike Protection*