
This magnetic sensor precisely identifies door and window open/closed status. When separated, it instantly sends signals to the matching alarm hub. The system delivers 3 types of real-time warning notifications: mobile APP push alerts, alarm SMS and emergency phone calls, so you can grasp abnormal access anywhere remotely without delay.

Equipped with built-in anti-tamper button, the sensor will trigger an alarm if anyone attempts to pry or remove it illegally. It also supports low voltage reminder function. When the CR2032 battery power drains, it automatically sends a weak battery notice to your APP, reminding you to replace batteries in advance to avoid protection failure.

No drilling, no wall damage required. Just tear off the 3M adhesive paper on the sensor back, then stick two magnetic parts separately on door frames and doors/windows. The mini compact size fits narrow gaps perfectly. It takes only minutes to finish mounting, suitable for DIY installation without professional technicians.

Operated by single CR2032 3V button battery, the sensor keeps ultra-low standby current for lasting endurance. Under open areas, its wireless signal reaches up to 80 meters for stable connection with alarm hubs. The 433MHz frequency offers strong anti-interference performance, ensuring reliable signal transmission in complex indoor environments.

The D30 contact sensor works on all openable closed structures, including wooden doors, glass windows, safe deposit boxes, storage drawers and cabinets. It serves residential houses, schools, factories, hotels, retail stores and office buildings. Small and portable, it realizes full-range perimeter security monitoring for both home and commercial spaces.

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