If you want to think about a car alarm in its simplest form, it is nothing, but one or more sensors connected to some sort of siren. The very simplest alarm would have a switch on the driver's door, and it would be wired so that if someone opened the door the siren would start wailing. You could implement this car alarm with a switch, a couple of pieces of wire and a siren.Most modern car alarm systems are much more sophisticated than this. They consist of an array of sensors that can include switches, pressure sensors and motion detectors, a siren, often able to create a variety of sounds so that you can pick a distinct sound for your car, a radio receiver to allow wireless control from a key fob.
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Car security systems and technologies can be broken down into three main categories: deterrents, immobilizers, and trackers. Deterrents are often successful at warning or scaring off potential thieves, immobilizers make it difficult or impossible to drive a stolen vehicle away, and trackers facilitate the process of finding vehicles after they have been stolen. Since each of these categories addresses a different issue, car security systems often use more than one type of device.
A Horn or car horns is a sound-making device that can be equipped to motor vehicles, buses, bicycles, trains, trams and other types of vehicles. The sound made usually resembles a "honk". The vehicle operator uses the horn to warn others of the vehicle's approach or presence, or to call attention to some hazard. Motor vehicles, ships and trains are required by law in some countries to have horns. Like trams, cars and motor bikes, bicycles are also legally required to have an audible warning device in many areas, but not universally, and not always a horn.