... super wide input voltage range from 90v to 280v,available for those areas with unstable intility grid,and increase life-span ... loads ,such as tube-lights, TV sets, air-condition, fans, refrigerators, motors, wind generator, solar system and so on,8) 4 steps ... can realize software control function)and SNMP Remote ministering ports for option,12) SONCAP certificate,CE certificate and ISO9001 Certificate, ...