gasoline&NG dual fuel genset tech,electric start /4wheels kit for option;automatic function for option(the only in china) ENG2500S,3500S,6500S,7500S:2.0KVA,2.5KVA,5KVA,6KVAEngine: Single cylinder,4-stroke, air cooled, gasoline&NG engineernator: brush synchronous AC type generator 2KVA,2.5KVA,5KVA,6KVA Silent Gasoline&NG Dual Fuel Generator Set