A set of state-of-the-art car alarm system should also include a separate alarm, the alarm can issue sharp siren. A lot of noise makes people notice the car thieves, so most car thieves will quickly fled the scene when sirens sound. Some alarm systems have set the alarm sound; you can select a unique sound, so as not to confuse with other vehicles. Some alarm systems can play a recorded warning when someone is too close to the vehicle. The main purpose is to warn the thieves that your car is equipped with a state-of-the-art ultrasonic alarm sensor before the theft. In most cases, the recidivists ignore such warnings, but for amateur car thieves who try their luck, this will play a strong deterrent. In a sense, this gives the alarm system the power to deter criminals. Inadvertently, your car is not just a concoction of the device, become equipped smart machine.
The car alarm system will use more high-tech in future