Description Renogy MC4 Branch Connectors are used for parallel wiring solar panels (PV modules). Sold as a pair, these “Y-Connectors” will maintain the voltage of the solar panel configuration to match the battery size. These connectors are solely compatible with MC4 connectors and come with one male (MMF) and one female (FFM) connector. Use these MC4 Branch Connectors to make tight, waterproof connections. If you have any questions regarding this product, please submit a case! Hard plastic One FFM and one MMF Package Includes Renogy Solar MC4 Branch Connectors MMF+FFM Pair 1 x Renogy Solar Panel MC4 Branch Connectors (Pair) Withstanding voltage: 1000V DC(TUV), 600V(UL) Contact Resistance: 1m Protection Class: Class II Temperature: -40°F to +194°F Protection Degree: IP67, mated Unmating Force:147.51Ft·lb Insulation Material: PC/PA Contact Material: Copper, silver plated Flame Class: UL94-V0 or UL94-5VA Warranty Information Accessories 1-year material warranty