Years ago when car alarms were new, they would draw attention if they went off. There are plenty of options out there to protect your vehicle and car alarms are now probably the most useless. More often than not in my area a car alarm constantly going off at night is going to get you ticketed or towed rather than saving you from a stolen car. The reaction to car alarms is insignificant nowadays. Most people might glace at the car making all the noise but they really aren't paying attention. Security that immobilized a vehicle is a far better way to protect your investment than an alarm. When a car alarm is ringing, do you pay attention?