A. This is a power protection product specifically designed for upgrading car audio systems. It combines the functions of a fuse holder and a fuse box and is equipped with mini fuses, which can provide reliable circuit protection for your car audio system. B. Its structural design is reasonable and can well meet the needs of upgrading car audio systems. The mini design not only saves space in the car but also allows for flexible installation in limited spaces, making your upgrade process more convenient. C. The charging type is an ordinary car charger, using a wired charging method. This stable charging method can ensure continuous and safe power supply for the car audio system. During use, it can effectively prevent problems such as circuit overload and short - circuit, avoiding damage to the car audio system and extending the service life of the audio equipment. D. Whether you are driving daily or enjoying music, it can protect your car audio system, allowing you to enjoy the music experience during your journey.