Sine Wave Output Input Power Factor Correction DC Start-up Bypass Protection No One Around Function Frequency Conversion Startup Function Long Endurance Design Self-Check Function Stable to Disturbance Possible to Collocate with Power Generator Able to Connect with Inductive Load Build-in High Quality Valve-Control Lead-Acid Storage Cell Microprocessor controlled Line Interactive Technology Boost and buck automatic voltage regulation (AVR) Advanced battery management (ABM) Short circuit and overload protection Lightning and surge protection Fault status LEDs Cold start & energy saving features Input Voltage: 230V or 220V+-25 Output Voltage: simulated sinewave 220V+-10 Frequency: 50 or 60 Hz+-1 Telephone / modem internet surge protection Communication: RS232 port Back up time: 5 - 30 minutes (depending on computer load) Contact to me,skype:netcca-kayvi Em kayvi-tan at qq dot com netcca001 at 163 dot com msn:kayvi01 at hotmail dot com