... Efficiency 3.Small Size,Light Weight. 4.Zero Transfor 5.Pure Sine Wave Output. Application FieldsData Processing Center, ... including line interactive design, AVR (auto voltage regulations), USB communication port, alarms for battery backup, low battery and overload, ... .Acoustic noiseAt 1 meter distance< 55 DBACommunicationsDB-9 Port RS232 serial interfaceIntelligent slotOptions,Web Power,AS400 or Win ...