Basically the problem is remote control. Thieves, I presume, have universal remote controls, like the ones we have at home to play our tv, dvd players, music system etc. Although the vendors claim that their security devices cannot be operated from any other remote control except wiht the one provided in the package, I still have my doubts. But it gives me the peace of mind that at least car would make some noise if the ordinary street theif tries to steal the music system. For car lifters it is a peice of cake. I used to have one Khyber with remote security system, but the real peace of mind came from the tri-circle padlock which I used to install in the steering coupling near brake pedal,,,which is difficult to brake. Also Mehran users can use Tri circle lock just down the steering. Though my new Corolla is insured, I still went for the security system, which keeps on stopping making noises, the vendor who isntalled it had given life-time warranty and when I went to him second time, he said that programming went out and he fixed it...strange...still no peace of mind.