Security awareness of ordinary families in the past is weak, many people think that the community security patrols regularly, the home is equipped with security doors, natural security precautions are guaranteed, and there is no burglar alarm equipment installed in the home. In recent years, people’s concerns about their own security issues have increased. Many families have installed anti-theft nets to protect the safety of people and property, but these traditional physical protection systems have experienced various drawbacks in practical applications, such as sudden encounters with disasters that hinder escape and many other disadvantages. In addition, many shops, warehouses, villas and hotels are scattered, which is difficult to supervise by manpower, and security accidents such as theft often occur.

How to prevent theft and prevent theft in advance has become the focus of social attention. The burglar alarm system can play an effective role in protecting houses, preventing theft, reducing common crimes such as vandalism and house robbery, and can even be used to reduce indoor accidents.

The most important prevention is the anti-theft of doors and windows. The most detectors we use on the doors and windows are the door contacts. The door contact is used to sense the door or window to trigger the alarm, is one of the most important burglar alarm device in the alarm system, among which the wireless door contact is very widely used, and we must understand the wireless door contact installation method：

1 Wireless door contact installation method

The important components of the wireless door contact are induction reed and magnets. Wireless door contact is the use of magnets, which can control the reed opening and closing. When the two parts are close, the reed is closed, if the two are separated, the reed will be disconnected, then the disconnection signal will touch the transmitting frequency circuit to send a wireless alarm signal to the alarm control panel. Wireless door contact is installed in the active doors and windows. When the doors and windows open or close (as per the wireless door contact alarm type, normally open/ normally closed), also it will trigger the alarm.

 When we install a wireless door contact, we should follow the following steps：

 (1) Close the doors and windows to determine the installation location of the wireless door contact.

 (2) Promote doors and windows to check whether the wireless door contact installation area will touch the doors and windows or other objects around.

 (3) Clean the corresponding position of the wireless door contact installed on the doors and windows, and stick it with double-sided adhesive; or remove the cover plate of the two wireless door contact parts (part A and part B), fix it with screws, then install the cover plate.

 (4) Check the wireless door contact installation effect, the magnet and the transmitter are aligned? Are the two parts close? Is there an installation error in the direction?

 (5) Connect the wireless door contact to the alarm control panel, switch doors and windows to test the wireless door contact installation.

2 Wireless door contact installation precautions

• Wireless door contact part A (transmitter) and wireless door contact part B (magnet) should be installed separately, that is, the transmitter should be installed on a fixed door frame or window frame, and the magnet should be installed on the active door and window.
• The magnet is aligned up and down with the transmitter and the spacing between the two parts should not be greater than 10 millimeters.
• For the best wireless transmission distance, pull the antenna of the wireless door contact out with the direction perpendicular to the ground.
• If there are two LED lights on the wireless door contact, usually when there is a light that is always on, it means that the battery power is insufficient(according to the wireless door contact user manual), please replace the battery in time.
• The wireless door contacts used in different doors are different. For example, the iron gate we should use is a wireless iron door contact. Because the magnetic field of the iron door contact is very strong, it is suitable for installing on the iron door. Many users will install the ordinary wireless door contacts on the iron door.
• The coiling doors are different with other doors. For the convenience of installation, we should use the wireless coiling door contact, anti-pressure, anti-seismic, special for the coiling doors. When installed, insert the transmitter part of the wireless coiling door contact into the ground directly below the coiling door, mount the magnet on the coiling door, align with the transmitter part, and the transmitter of the wireless coiling door contact can be installed on the wall.