My car was running completely fine before having the device installed. I had to replace the battery about 1 week after it was installed which cost $115. I broke down in the middle of a busy highway, which almost caused multiple accidents, in addition to high stress and anxiety. I then had to get towed for $80. Now I need to replace the alternator. Every time I call to speak to someone takes 25 minutes. I cannot for the life of me get in touch with Duane Beers, the rep that sold the device to me. Every time I email him, I get ignored. Horrible service.