Headphone Extension Cable 3.5 mm TRS to 3.5 mm TRS Headphone Extension Cable This cable is designed to extend the reach of hard-wired headphones with a mini stereo phone plug. It may also be used as a stereo extension cable. Features include: • Nickel-plated contacts for rugged durability and efficient signal transfer • Oxygen-Free Copper (OFC) conductors for enhanced signal clarity • OFC spiral shield for effective EMI and RFI rejection and flexibility