Wiring was already done by the previous owner. Sound works without any problems. It was originally installed in a real vehicle (vehicle number unknown) and shows signs of use. The exterior had soot stains, which I wiped off. I haven't tested it myself, but it seems you can also do line recording and use it with a conductor switch if you change the wiring. Sound demonstration video: https://youtu.be/8KzJc3FhGhg?si=GMQB1RRs3mJ34qgm