The system itself has a shock rebound function. For more safety protection, some users can add a photoelectric sensor. For exterior doors. When the door is closed, cut off the infrared or a child runs through the closing door and the door will open. When opening the door opener at night, the strobe lights can alert intruders in the dark. When you have a lot of people in your home, you need a keyboard. As long as the password is known, the door will be opened for the owner. Today's life has too many keys, and the belt is full, which is simply a burden. Don't worry, the remote control button in the car is hung on the sun visor, it is more convenient to open the door Load the module, you can directly control the opening of the door on the mobile phone APP. Remote control, not limited by distance, needs to ensure that the device is connected to the Internet and supports 2.4G wireless network., Manufacturer: DMETE