1.Directly use for emergency system. 2.After power off, can keep working work an hour. 3.Metal casing 4.Warm start 5.Lower Weight 6.High power factor 7.According to EN61347-2-3,EN60929,EN55015,and EN61547 8. No-noise operation 9.Suitable for use in frequently switched applications (>20000) 10. Max housing temperature Tc:70oC 11. Operating temperature Ta:-15oC; 50oC