APP functions are as follows: 1. Quick account switching: Use the left and right keys to quickly switch between upper and lower accounts. 2. Remote setting: The security system can be set to warn you at any time and place. 3. Remote release: your security system can be released at any time and place. 4. Loop monitoring: You can monitor the loop status of your security system at any time and place. 5. Declaration: The contents of the declaration can be sent to the security company at any time and