1. This is a professional power amplifier grounding wire hub - negative grounding distribution box, specifically designed for car audio system modification. It has an excellent design and is made of two materials: zinc alloy and pure copper. 2. Using pure copper material can ensure good electrical conductivity, enabling efficient current transmission, reducing signal interference, and providing stable grounding for the car audio system. This makes the sound quality purer and clearer. The one - to - four design is very practical and can meet the grounding needs of multiple devices in car audio system modification. It can effectively integrate the grounding wire connections, making the wiring layout of the entire audio system more reasonable and orderly. 3. This distribution box is suitable for car audio system modification scenarios. Whether you want to upgrade the in - car audio effect or carry out professional car audio system installation, it can play an important role. 4. It is widely sold in regions such as Africa, Europe, South America, Southeast Asia, North America, Northeast Asia, and the Middle East, and is well - received by users in various places. In addition, it has an authorized own brand and reliable quality.