This 3.5mm TRRS to 4 pin screw terminal cable is ideal for quick audio wiring conversion. One side is standard 3.5mm stereo male plug, the other side is 4-way screw terminal block, no welding needed, easy to connect speaker wires and audio lines. High-quality internal wire core ensures stable signal transmission, effectively reduce noise interference. It supports audio playback and microphone input at the same time, widely used for home speaker installation, headphone circuit modification, audio equipment assembly and professional AV system layout. Comes with 2 pieces to meet your multiple wiring needs, easy to install and durable for long term use.