　　
The electronic alarm alarm mainly relies on locking ignition or starting to achieve the purpose of anti-theft, and has anti-theft and audible alarm functions. The remote-controlled car alarm features all the functions of the remote-controlled alarm, which is reliable and convenient. It can be equipped with vibration detection and gate protection and microwave or infrared probe function. However, electronic alarms generally have false alarms, and they have not fundamentally solved the problem of vehicle loss.
　　
　　 Mechanical anti-theft device : cheap, can not alarm
　　
The mechanical anti-theft device mainly relies on locking the clutch, brake, throttle or steering wheel cover, and shifting gear to achieve the purpose of anti-theft, but only the anti-theft does not alarm. The advantage is that the price is cheap, the installation is simple, and a few hundred yuan or even tens of yuan can be fixed. The disadvantage is that the anti-theft is not complete, it is more troublesome to disassemble each time, no need to find a place to place.
　　
　　 GPS anti-theft device : good but expensive
　　
The GPS satellite positioning car anti-theft system is a network type anti-theft device. It mainly relies on locking ignition or starting to achieve the purpose of anti-theft. At the same time, the GPS satellite positioning system can also transmit the alarm information and the location of the alarm vehicle to the alarm center silently. The anti-theft effect of this product is obvious, but the disadvantage is that the price is relatively expensive.
Temperature And Humidity Sensor
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