A. This is a practical accessory specifically designed for car audio systems - the speaker junction box clip-on terminal. It features a unique design with various styles to choose from, including two classic shapes: square and round. B. In terms of usage, it is helpful for testing the sound effects of car audio speaker wooden boxes or empty speakers. Thanks to its spring-loaded wire clip design, the wiring process becomes easy and convenient, enabling quick and stable connection of the speaker circuit. C. You don't have to worry about the cumbersome wiring work during the sound effect testing process. D. Whether you are a professional car audio modifier or an enthusiast keen on DIY car audio system modification, this terminal can meet your needs and help you easily create an ideal car audio sound effect.