... (4).Class A material(5).Class B material Product name:telephone plugModel:tyf-a031Specification:P42T4SSE01(4S)Application: used for the connection ... or 60HZ 1mininsulation resistance:39 millions max mechanical cable to plug tensile strength:7.7kg mindurability: 750 mating cycles minmaterial housing ... plating:3u,6u,15u,30u,50u,60u. Working temperature :4060 TELEPHONE PLUG,RJ12 PLUG(4P2C)