For many years now, car manufacturers, especially Toyota, have made nearly 80% of the wiring in their cars aluminum wiring, and even the websites of major manufacturers that make genuine wiring have very detailed information about how to handle aluminum wiring. If you unnecessarily strip the wiring or touch it with your hands, it will oxidize and corrode slowly like a time bomb. The worst case scenario is a terminal illness in which electrical connection is not possible even though the connection appears to be connected.Recently, speakers have become diverse, including emergency guidance speakers, so if you cannot hear the operator's voice in the event of an emergency, your life could be at risk. It will be. Of course, it is important to improve the sound at our shop, but we also strive to create a system configuration that is safe, secure, and error-free, and is tailored to the vehicle.