Smart Window/Door Security Sensor — realtime protection, simple automation, precise control Key benefits Instant alerts: Receive realtime app notifications the moment the sensor status changes so you always know if a door or window opens. Reduce false alarms: Use the programmable timer to limit when the sensor is active (for example 10 PM–7 AM), so notifications and alarms occur only during chosen hours. Automate your home: Create smart linkage scenes to turn lights or the air conditioner on or off automatically when the door opens or closes. Local audible deterrent: Builtin mini horn produces an 80 dB alarm with adjustable volume to draw attention and deter intruders. What this sensor does Monitors contact status of doors and windows and sends immediate push notifications to your mobile app when opening or closing is detected. Triggers connected smart devices (lights, aircon, etc.) through appconfigured scenes so the home responds automatically to arrival or departure. Activates a local alarm (80 dB) when configured; you can increase or decrease the volume to match your environment and preference. Operates only during the times you set when using the timer function, preventing unwanted alerts outside scheduled periods. Important attributes Function: Wireless contact sensor for doors and windows with app notifications, smart device linkage, timer scheduling, and builtin alarm. Compatibility: Works with the product's companion mobile app and supports smart linkage with lights and air conditioning systems via the app's scene setup. Performance: Realtime push alerts; 80 dB builtin horn; adjustable alarm volume; timerbased activation to control when alerts and alarms are active. Model/Type: Wireless door/window contact sensor. Practical use scenarios Home security at night: Schedule the sensor to be active from 10 PM–7 AM. If a door opens, you receive an app alert and the sensor sounds an 80 dB alarm to alert household members and deter intruders. Child or pet monitoring: Get immediate notifications if a child or pet opens a door, then trigger lights automatically to make it obvious if someone leaves unexpectedly. Convenience on arrival/exit: Create a scene so lights and the aircon turn on when you open the door and turn off when you close it on your way out, saving energy and improving comfort. Why customers choose this sensor Clear, actionable alerts and a loud local alarm help you respond quickly to unusual activity. Timer scheduling reduces unnecessary notifications and gives you control over protection hours. Smart scene linkage adds convenience by coordinating lights and climate with door activity. Includes Wireless door/window contact sensor with builtin mini horn and mobile app support. Note: This description reflects the product's functions: app alerts, smart linkage with lights and aircon, timer programmable activation (example 10 PM–7 AM), and an 80 dB adjustable alarm.