There are many types of car alarms. The principle is mechanical, electronic, chip-type, network (providing: network camera products), anti-theft mode to lock the steering wheel, lock the throttle, lock the door, lock the brakes, lock the shift lever and even lock the wheel. Mechanical locks are the earliest and most common applications. They are rarely used alone. They are mainly used in combination with electronic and chip types. They are mainly divided into steering wheel locks and partner locks. Mechanical locks primarily serve to limit vehicle operation. The electronic anti-theft device is one of the most widely used anti-theft devices, and is divided into two types: one-way and two-way. There are four main functions: First, the alarm function. If someone swings the door or uses the key to open the door after the door is locked, the alarm will be immediately called. Second, the door is not closed, the third is the car search function, and the fourth is the remote central locking. The two-way electronic anti-theft device is more intuitive than the one-way one. When the car has a change alarm, the liquid crystal display on the remote control will display the condition of the car. The fatal injury of the electronic anti-theft device is that when the owner manipulates the remote control, the car thief can use the receiver or scanner to steal radio waves or infrared rays emitted by the remote control, and the car's anti-theft system can be turned on after decoding. Chip-type digital (for products: wireless digital video recorder products) anti-theft device is the focus of the development of car alarms. The basic principle is to lock the motor, circuit and oil circuit of the car, to eliminate the drawbacks of being scanned, and to make keys on the roadside. The car cannot be started even if the door can be opened. As long as the cyber anti-theft device has a GSM network coverage, the owner can search for the location of the car through the network, and implement anti-control parking, monitoring, shouting, and fuel cut-off measures to the robbed vehicle.
1, mechanical lock
    The mechanical lock is the most common application and the earliest car anti-theft lock. It is said that it is the same as its own door lock, and it has rarely been used alone. Mainly divided into steering wheel lock and gear lock two categories. The steering wheel lock is used by most owners and does not require installation. The gear lock is generally installed on the center console, the lock body is connected with the body, and the shifting handle is restricted by the lock ring, but the drilling is required to be installed, so there are not many people using it. In addition, there is a new type of transmission lock, which is directly made into a shifting handle with a built-in latch. It looks very beautiful, but the price is nearly 1,000 yuan, and it is even more uninvited to replace the original shifting handle.
    Mechanical locks mainly play a role in limiting the operation of the vehicle. They can provide limited assistance in anti-theft and it is difficult to resist the theft of heavy tools such as shovel, hacksaw and large scissors. However, they also have their advantages. It is a fact that can delay the crime of stealing car thieves. Generally, car thieves can use dozens of seconds or even minutes to open the steering wheel lock, and the time of the shift lever lock is longer.
2, electronic anti-theft system
    The electronic anti-theft lock is one of the most widely used anti-theft locks, and is divided into two types: one-way and two-way. The main functions of the one-way electronic anti-theft system are: the door opening and closing of the car, vibration or illegal opening of the door alarm, etc. There are also some brands of products that add some functions according to the customer's needs: use an electronic remote control to complete the engine start, flameout and so on. The two-way visual electronic anti-theft system is much more advanced than the one-way one. It can completely let the owner know the reality of the car. When the car has a change alarm, the liquid crystal display on the remote control will show the condition of the car, but the disadvantage is The effective range is only 100-200 meters.
    Mastering the stick, but aiming for the yard. The electronic anti-theft system has a fatal injury: when the owner uses the remote control to open and close the door, the car thief hiding in the vicinity can use the receiver or scanner to steal radio waves or infrared rays from the remote control, and then decode the car to turn on the car. Anti-theft system.
3, chip type digital alarm
    Chip-type digital anti-theft device is the focus of the development of car alarms. Most cars use this anti-theft method as the original anti-theft device.
    The basic principle of the chip type digital anti-theft device is to lock the motor, circuit and oil circuit of the car, and the vehicle cannot be started without the chip key. To use the password key to touch the lock on the car to unlock, to prevent the scan of the ill. At present, many high-end cars imported, domestic Volkswagen, Guangzhou Honda, Palio and other models have been equipped with the original chip anti-theft system.
4, network security
    Network anti-theft refers to the function of opening and closing the door, starting the motor, stopping the car, positioning the car and providing the remote condition report according to the requirements of the owner. Network security is mainly to break the limit of distance.
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