There was often static with this transmitter and it gradually worsened. I had to unplug it each time I parked the car because I believe it killed my car battery once. My battery was fine after I started unplugging. After only a few months, the device would start sliding out of the socket without anyone touching it. Maybe it wore down? Then this thing broke into pieces but the wires were still hanging on. The charger still worked but the transmission was very bad, more static. I just replaced it with a much sturdier and better sounding transmitter.