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 two large-capacity button cell batteries, it offers an ultra-long standby time, providing lasting 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 grams, it takes up minimal space and can easily pass through 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 base provides strong grip and remains stable 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 alarm in the gap between the door and the floor and 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 during hotel stays, travel, solo living, or business trips. When used at home, it helps alert you to unusual activity near your door, enhancing personal safety and enabling restful sleep.Alarm function: The door stopper includes an 80 dB alarm that activates instantly 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 grams and comes with a storage bag, making it ideal for travel.Innovative design: The triangular structure utilizes physical principles to ensure a stable hold. The non-slip rubber base enhances stability on different floor surfaces.Easy installation: Installs in just 3 seconds without tools. Tighten the screws to secure the door stopper in place (door gap: 525 mm).Protection against intruders: Helps prevent unwanted entry. Suitable for travel, hotel use, or home application, providing a sense of safety when alone.