1. This splitter for car audio system modification is designed for upgrading car audio systems. It is a 2-to-4 splitter junction box for negative ground wires, which can meet diverse wiring needs. 2. It is made of zinc alloy, a durable material. This ensures that it can be used stably for a long time in a complex car environment and provides a reliable connection for the car audio system. 3. In terms of design, it is quite good. It has strong versatility and can be compatible with all car models. No matter what kind of car you drive, you can easily install and use it. There's no need to worry about compatibility issues, which can save you a lot of time and effort. 4. It has a wide range of applications. During the car audio modification process, it can achieve reasonable distribution and connection of ground wires and effectively improve the sound quality of the audio. This allows you to enjoy a shocking sound effect similar to that of professional audio equipment in the car. Whether you are driving daily or on a long - distance trip, it can bring you an immersive music experience.