Set of 2: 1 black cable: 20FT, 1 red cable: 20FT, Compatible with Renogy/Jackery/SunPower/Goal Zero/EcoFlow/Harbor Freight Photovoltaic Systems Cable Specifications: TÜV certification, Wire Gauge: 10AWG / 6mm² , Resistance: 0.8Ω/km, Cable Diameter: 6.2mm, Connectors: MC4 male and female connectors pre-installed, Rated Current: 25A,Temperature Range: -40℉-194℉ (-40°C-90°C).Rated Voltage: 1500V. Oxygen-Free Copper Core: Crafted with oxygen-free pure copper cable cores, this design minimizes energy loss during transmission, ensures safe operation, and prevents overheating, even during extended use IP67 Waterproof and Durable Design: The cables feature an oxygen-free copper core with a high-strength PVC outer layer, which is fireproof, corrosion resistant, and UV resistant, can withstand extreme heat and cold -40℉~194℉(-40℃-90℃). IP67 waterproof rating ensures reliable outdoor use.Solar connectors have a 25+ years lifespan. Installation and Use: Each solar extension cable comes equipped with pre-installed standard MC4 male and female connectors. The connectors use a stable self-locking system, making them easy to lock and unlock during operation Connecting to an MPPT Controller: When connecting to an MPPT solar charge controller, the MC4 connectors on one end need to be removed with tools to connect securely to the MPPT controller's solar panel interface Applications: These solar extension cables are ideal for: Solar power plants, Photovoltaic connectors, Marine installations, Recreational vehicles (RVs), Home Solar Systems, Compatible with most solar modules with similar connector types, enabling seamless integration 1 black cable: 20FT, 1 red cable: 20FT, Wire Gauge: 10AWG / 6mm² , Resistance: 0.8Ω/km, Cable Diameter: 6.2mm, Connectors: MC4 male and female connectors pre-installed, Rated Current: 25A