system features
1. Automatic opening
When a user with a mobile phone arrives at the entrance of the front door, the front door opens automatically. (Refer to the attached file for the principle)

2. Manual opening
You can open it manually using your phone

3. Complementary and safe
-By minimizing number key input, you can prevent infectious diseases such as viruses.

-If you have luggage in both hands, you can come in and out easily

- You can maintain excellent security by using your mobile phone