1. Purpose: Suitable for cars, ships or other means of transportation. If you need a quality product, this is a choice. Please confirm the picture in advance to make sure this is the correct part. 2. Purpose: Suitable for cars, ships or other means of transportation. If you need a quality product, this is a choice. Please confirm the picture in advance to make sure this is the correct part. 3. Stable performance: The power supply automatically shuts down when the current is overloaded, providing complete protection for your car audio system and convenient inspection and replacement. --Power supply bracket: Car audio bracket with voltage display! Made of high-quality metal alloy and plastic materials, it is durable, stable and reliable. 4. Material: Made of metal alloy and plastic, it is wear-resistant, stable and can be used for a long time. --About installation: Provide complete protection for your car audio system. If you don't want to display for a long time, you can ground the fuse holder without connecting it, and then ground it when you need to check the line to display it!