Smart Alarm Door Sensor — Door Open/Closed Detector with App Notification, High Sound Home Security

Compact smart door/window sensor that detects open and closed states and sends notifications to your phone. It can also trigger actions — for example, turn lights on or off when the sensor is activated — and includes a loud built-in alarm. Key features: - App notifications when a door or window is opened. - Action-triggered light control to switch lights on/off based on sensor events. - Battery-level display with a low-battery reminder so you always know when power is running low. - Share the sensor with family members so multiple people can monitor and control the device. - Simple peel-and-stick installation for quick setup and use.