Is a car alarm installed in the car, used to increase the difficulty of car theft, car theft devices to extend the time.

      Car alarm type with the progress of science and technology to combat car theft means escalating, people from generation to generation developed a variety of ways, anti-theft devices with different structures, the current anti-theft device according to the structure can be divided into three categories: mechanical , electronic and network type. Hook lock, steering wheel, gear shift locks and lock basically a mechanical anti-theft devices, which rely mainly on locking clutch, brake, throttle or steering wheel, shift speed to achieve security purposes, but only anti-theft alarm. Blade, push-button remote control and belong to electronic security, it is mainly by locking the ignition or starter to achieve security purposes, but also has anti-theft alarm and sound. GPS satellite positioning vehicle anti-theft system is a network-based security, which mainly by locking the ignition or starter to achieve security purposes, while also through the GPS satellite positioning system (or other networks), the location of the vehicle alarm information and alarm silent transmitted to the alarm center. Remote control car alarm features remote control car alarm with the advances in electronic technology and developed, it is to promote the popularity of the most widely used on the market. It is characterized by remote control anti-theft device all the functions, reliable and convenient, can take vibration detection, protection and gated microwave or infrared sensor and other functions.

      As the market for anti-theft device is ever increasing, remote control car alarm adds many additional features easy to use, such as remote central locking, remote place to send cold or warm wind, remote control electric windows and remote control to open the luggage compartment and other functions. Main configuration remote control car alarm complete set of remote control car alarm consists of the following components: (1) host part: it is the core and control center of anti-theft device. (2) sensors detect part: it may be sensors or probes, and currently widely used is the oscillation sensing device, small microwave and infrared sensor applications. (3) gated section: includes a front cover switch, door switches and luggage compartment switch. (4) the alarm section: Speaker. (5) wiring portions. (6) Other parts: including self-adhesive, screws and other accessories relay and instructions for use and installation wiring diagrams. Anti-theft device password with mobile phones work on the same principle, between the remote control transmitter and host security system remote control car alarm except to have the same transmit and receive frequencies, should also have a password in order to recognize each other. Immobilizer password is a group of different combinations of data, is a key anti-theft device. On the one hand it records the alarm of identity (identity code), the difference between all the different anti-theft devices; on the other hand, it inside his mouth, anti-theft function instruction data (data code or script), is responsible for opening or closing alarm , complete control of all alarm functions. In other words, with this password, also mastered the key to unlocking the antitheft device.

       Several main types of remote control car alarm according to the different means of transmission of password, remote control car alarm security code is divided into fixed and hopping code anti-theft device types. Early use of anti-theft devices given code way, but because of its own shortcomings, has gradually been replaced by the more advanced technology, better security hopping code alarm. Here are two different types of alarm principles and characteristics were to be introduced. Fixed code alarm early car alarm remote control a variety of host and the remote control have the same set of password, the remote control transmitter password, host receives a password to complete the anti-theft device, which is called the first emission password on behalf of the fixed code transmission mode (referred to as the fixed code transmission mode). Fixed code transmission mode used in the car alarm is not popular, when the amount is not much alarm, that alarm at an early stage in the application market, its anti-theft device as well as safety and reliability are guaranteed. But for a burglar uses a mature market, the way it is given the code is neither reliable nor safe, for three reasons: (1) a password less prone to repetition code, which occurred in a remote control of multiple vehicles phenomenon. (2) the remote control is lost, if the individual replace the remote control extremely unsafe, unless a replacement along with the host, but the cost is too high. (3) That is the greatest risk of poor security, passwords easily copied or stolen, so that the vehicle is stolen. Code hopping anti-theft alarm given code password there has long been less prone to repetition code and password can easily be copied to steal such insecurity problems, so in 1996 there have been password-learning code hopping anti-theft device, which is characterized as follows: (1) in addition to the remote control password identity code and script, the addition of a code hopping part. That password code hopping according to a certain coding functions, once every launch, immediately change your password once, the password can not be easily copied or stolen, security is extremely high. (2) on the one hundred million group password combination, simply eliminate duplicate code. (3) No password host, the host through the remote control code learning, in order to achieve mutual recognition between the host and the remote control. If the remote control is lost, safe and cost-effectively replace the remote control, no worries.