... speed governer; Alternator Option: MARATHON, ENGGA, STAMFORD, CHINA-MADEBrushless PMG (permanent magnet generator), self-excitation,Brushless sigle bearing,IP21/23 protection,H ... Self-ExcitationBrushless Self-ExcitationInsulation Class H/H H/H Protection Grade IP21-23 IP21-23 Noise Level65-85db @7m 65-85db ...