Highly sensitive door stopper: The door stopper features a loud alarm function with 80 decibels. Equipped with a highly sensitive intelligent sensor chip, the device immediately emits an alarm for up to 5 seconds when it detects vibration. Powered by 2 large-capacity button cell batteries, it offers an ultra-long standby time, providing a lasting sense of security.Durable and lightweight: This integrated door stopper with anti-theft protection is made of lightweight aluminum alloy. It offers excellent load-bearing capacity and durability while remaining lightweight and easy to carry. Weighing only 252 g, it takes up minimal space and can easily pass through various security checks. It includes a dedicated storage bag for convenient portability.Design innovation: This alarm door stopper features a metal lever and a triangular integrated design that applies principles of physical mechanics. It effectively redirects the force of the door against the floor, shifting the center of gravity to achieve a stable door-holding effect. The non-slip rubber pad on the bottom provides strong grip and ensures stability on various floor types.Easy to install: This door stopper is quick and easy to set up, requiring only three seconds for installation and removal. No drilling or tools are needed. Simply place the door stopper in the gap between the door and floor, then tighten the screws clockwise. Note: The gap between the door and floor must be between 5 and 25 mm.Security protection: This retractable alarm door stopper helps deter unauthorized entry, offering added peace of mind when staying in hotels, traveling, living alone, or on business trips. It provides reassurance against unexpected movements outside the door, helping you feel secure and sleep more soundly.Alarm function: The door stopper includes an 80 dB alarm that activates immediately upon detecting vibration. With an intelligent sensor chip and long-lasting battery life, it delivers reliable security performance.Lightweight and portable: Constructed from lightweight aluminum alloy, the door stopper weighs only 252 g and comes with a storage bag, making it ideal for travel.Innovative design: The triangular structure utilizes physical principles for enhanced stability. The non-slip rubber base ensures secure placement on different floor surfaces.Easy installation: Installs in just 3 seconds without tools. Tighten the screws to secure the device (door gap: 525 mm).Protection against intruders: Helps prevent unauthorized access. Suitable for travel, hotel stays, or home use, providing increased safety and peace of mind when alone.