Smart Door Sensor

Smart Door Sensor can detect the open-close state of doors and windows, when people leave home. Once the smart door sensor detects the door is opened, it will send the information of door opened to users mobile phone immediately. User can know if their houses are intruded, no matter where they are. With 2 AA batteries, the battery life is more than 1 year. It is also very easy to install, user should only paste the smart door sensor on the door and door frame.