Hi, I am an electronic. Here are a CDX-F5550 car radio. It do noting, only demo mode run. One home made audio-cd is inside, the radio don't eject it, don't play it. Can be here a next thing. This car radio needs own remote controller. If remote controller or car radio is removed or stolen, then this car radio locks. To unlock the radio need remote controller? Radio thievish do not need a radio to play anything. //writed ower Google Translator