If you have no idea about cellular backup, please read How does cellular backup work for Chuango WiFi Alarm LTE-400?
In case an alarm occurs, Chuango WiFi Alarm LTE-400 will send SMS messages and/or dial the stored phone numbers. The system is then in a 1-minute-monitoring state. When the homeowner does not pick up the call, it will continue dialing another phone number stored on the list. After picking up the phone, you are able to remotely control the alarm system by using the telephone keypad on your smartphone.
| Phone Button | Function |
| 0 | Disarm |
| 1 | Arm |
| 3 | Listen In |
| # | Hang Up |
| 6 | Turn Off Siren |
| 9 | Turn On Siren |
| * | Two-Way Talk |