This Smart WiFi Door and Window Sensor Alarm monitors the status of you doors and windows in real-time. By connecting your WI-FI 2.4GHz and mobile phone, an alert will be pushed to a mobile phone via an app when an abnormal status detected. Transmission distance is 45 meters with ultra-long standby time. It can easily installed using the adhesive tape to secure the main sensor onto the frame of the door or window. Align the secondary sensor with the main sensor and secure it using the smaller adhesive tape. Perfect not only on front doors or windows, but also on garage doors, liquor cabinets, front gate, safety deposit box, pet doors and more.