The best affordable car alarm is the Avital 3100LX. While it lacks the two-way, long-range remotes of more expensive car alarms, it features a warn-away feature, a six-stage alarm, a fault-proof starter interrupt and a keyless entry. When it comes to simple security systems designed to assault would-be thieves with noise, the Avital 3100LX is one of the most popular and highly rated car alarms on the market, and it costs less than $50. For value, it clearly beats out car alarms at a similar price, like the Pyle PWD701 and the ScyTek A20.

Despite being one of the most affordable ways of protecting your car (short of simply purchasing car alarm decals to put on the windows), the Avital 3100LX comes with some excellent security features. The best security feature is the fault-proof starter interrupt, which makes it impossible for thieves to hotwire your car.

Another great feature is the Zone-2 impact sensor. The sensor can distinguish between minor bumps and telltale significant movements indicative of someone breaking into your car. With small blows, such as someone accidentally bumping into your car while walking in a parking lot, the car alarm chirps a warning. If the movement continues or gets more intense, a 120 dB alarm goes off. If it's not loud enough to get people's attention, it's certainly loud and uncomfortable enough to make the thieving unbearable.

It comes with two remotes that have a range of 1,500 feet. One downside to the remotes is that they are only one-way, which means that the car alarm doesn't alert the remote when an alarm goes off. If you're not within hearing range of the car alarm, you'll never know it was set off.

On a positive note, the Avital 3100LX security system provides the convenience of keyless entry and trunk release. Both features are common in contemporary vehicles, which typically come with key fobs to lock and unlock the car remote, but this is a great way of adding this convenience to an older vehicle.

It also features a panic button, also known as a car finder. When you press the button, the car's horn beeps and the headlights flash, making it easy for you to find your car in a parking lot.

You don't have to spend hundreds to protect your car. While the Avital 3100LX may be simple, it provides excellent security with a Zone-2 impact sensor, a fault-proof starter interrupt and a loud alarm. It even provides some modern conveniences, like keyless entry and trunk release.

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