Compared with the traditional fire alarms, the smart fire alarm is more intelligent, convenient and flexible. In addition to the traditional alarm function, it can also be connected to the mobile phone. Then our users can remotely set and control our smart fire alarm through the mobile phone app, and can also monitor different levels of smoke/gas concentration, so as to make corresponding judgments and countermeasures. When the monitored concentration is within a certain range but relatively high, it will remind you to smoke less. When the smoke concentration is very high, it will make corresponding actions to remind you. Even if you are not at home, you can set it remotely and give a quick alarm through your mobile phone to master the situation at home at any time.