Join Two Stereo Audio Cables Together to Make a Longer Cable The GCAUD3535FF Audio Cable Adapter/Audio Coupler features two 3.5mm audio female connectors, providing a cost-effective way to combine two standard 3.5mm stereo headphone cables or convert a standard audio cable into an extension cable. The F-F Audio Cable adapter is backed by StarTech.com's Lifetime Warranty. The StarTech.com Advantage - Gold plated connectors increase conductivity and help reduce corrosion - Backed by a StarTech.com lifetime warranty and free technical support