1The door sensor is used with the sound and light alarm. After the connection, the door and window are pushed open by the thief, the door sensor separates and transmits the signal to the sound and light alarm, and the sound and light alarm sends out a large decibel alarm. 2The door sensor is used with the camera. After the association, the camera is connected to the network. After the door sensor is triggered, the camera will call to notify, and the eye can immediately open to watch the alarm situation. 3The door sensor is used with the Wifi host. After the door sensor is separated by the thief pushing the door, it transmits a signal to the host, and the host immediately pushes the alarm information to the user's mobile phone. 4This device cannot be used alone. It needs to be used with other interconnectable products such as the host (not include) or camera (not include). Very useful home security system kit. 5Adopting highquality ABS material, it has the characteristics of wear resistance, durability and long service life. Good choice for you.