How much does it cost to install a burglar alarm system on the door?

The alarm system consists of host+alarm (door magnet and infrared sensor)+telephone line (or sim card)+remote controller.

At present, there are two ways to connect the alarm: telephone line and mobile phone SIM card.

The door is equipped with a door magnetic alarm, which is wirelessly connected to the host. This is probably 25 yuan. There are about 40 infrared alarms, and the whole system: telephone line 100 yuan (generally including 1 door magnet+1 infrared+two remote controllers+host); Sim card 180~200 yuan, which is more expensive, and sim card is a mobile phone card, and there will be a monthly fee in the future.

If a telephone line is connected, you need to have a telephone line on your host (you can also use an extension). If there is an alarm, you can dial your own number (generally you can set 6 numbers). You can disarm by phone, or you can talk to the scene.

For SIM cards, generally only Unicom and mobile numbers can be used. When there is an alarm, you can set a short message or phone number in advance, and you can operate security and defense through short messages.

Of course, the latest is the wifi connection, and the app software of the smartphone installation manufacturer. I observe that there are not many products and they are particularly expensive. good luck