Timely notification: When External power failure,built-in battery low power,APP push and SMS notification. When External power success,APP push. When Tamper alarm,SMS notification. 5 groups preset alarm phone numbers: SMS on/off and dial on/off can be set respectively. Timing arm and disarm: Set the arm and disarm in advance,so that life is safe every day. Delay function: User can set arm delay and alarm delay according to own needs. Add camera: Work with camera,when Accidental invasion, You can remotely monitor the situation immediately, speak and scare away thieves.