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the people who break into cars most likely know how to get around alarms. i agree with the above requirements in an alarm. don't make it obvious you have expensive taste (ie viewable stereos, speakers, electronics, etc.). criminals also like cars with dark window tint because they know that costs money and that you may be trying to hide something. the alarm on my car has a shock sensor, a blinking red light, and a loud-ass speaker. that's all you really need IMO.