Product advantages: 1. a regular SIM card supporting 2G/GSM ,and a Wi-Fi 802.11 b/g/n(2.4GHz) network connection 2. Support Tuya application, and can network with other products supporting Tuya to form a complete smart home system.The host can be set and controlled by APP, supporting IOS/Android 3. Auto-dialer function will call up to 5 designated phone numbers in case of a security breach 4. Loud, Built in 85dB Siren ,alarm alerts neighbors and deters potential intruders 5. Home security system complete with fully programmable main unit and sensors 6. The hub sends a push notification and text message to your phone when a sensor is triggered if you enable the notification function located in your app settings. After that the hub will also make phone calls to each preset phone numbers. 7. The tamper switch (lever underneath the bracket) will trigger an alarm notification if an attempt is made to remove the hub from its installed location. And the alarm sounds. 8. Built in 11 languages ​​can be set,Can set the language:Chinese, English, Russian, German, Spanish, Polish, Greek, Italian, French, Portuguese, Romanian 9. Tamper switch,The tamper switch (lever underneath the bracket) will trigger an alarm notification if an attempt is made to remove the hub from its installed location. And the alarm sounds. 10. Contains RFID tag，RFID tags are easy to carry,Easy to use,Tap RFID tag reader zone to arm and disarm. 11. Host has SOS button,Use in case of emergency.After clicking,The alarm sounds and sends an alert notification to registered users.