Is there a really simple car alarm out there?

I remember way back in 1996 there was a cheap car alarm that connected to the same wire to the vehicles dome light so when the door was opened an alarm would sound. Every car alarm I search for seems to be really complex and I do not need that. I just need something that goes off when the door is opened without... show more I remember way back in 1996 there was a cheap car alarm that connected to the same wire to the vehicles dome light so when the door was opened an alarm would sound. Every car alarm I search for seems to be really complex and I do not need that. I just need something that goes off when the door is opened without using motion sensors.
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