... 4.Simple,quick installation MC4 compatible connector for solar junction box, 4mm cable Pairs of Multi-Contact male/ female MC4 pattern ... MaterialCopper,silver platedFlame ClassUL94-V0 or UL94-5VA Advantages of Solar Connector:•Simple,quick,safe and effective filed assembly• Develop independently ... time outdoor application•Approved by TUV MC4 compatible connector for solar junction box, 4mm cable