1. Please follow Installation Guide of the Door Sensor from the U-tec App's guide, then set up the Door Senor again.
2. Please do not mount the Door Senor on the kind of metal door that interferes with the magnet inside the Door Senor(In this case, the door sensor sticks to the metal door magnetically).
3. The Door Sensor should be mounted as close to the edge of your door frame as possible, or within 0 to 1''(25 mm) from the edge, and as close to the bottom of the extended deadbolt as possible, or within 0 to 1''(25 mm) from the edge.
If the WiFi signal is not very strong, the status of the Door Sensor might be delayed and remain the same as before.