yes but sometimes the more you spend the more shit you get. for example who needs sensors to turn on your headlights automatically. and who needs sensors to sense rain and turn your windshield wipers on automatically, not me!
although i am thinking about tapping another siren into the pre existing one and also placing a few motion sensors on the inside!
just buy one which sounds good, something point imob, all door entry detection, shock sensors, flashing lights, the works!