Highly sensitive door stopper: The door stopper features an 80-decibel alarm function. Equipped with a highly sensitive intelligent sensor chip, the device immediately sounds an alarm for up to 5 seconds when vibration is detected. Powered by 2 large-capacity button cells, it offers an ultra-long standby time, providing reliable security. Durable and Lightweight: This anti-theft integrated door stop is made of lightweight aluminum alloy. It offers excellent load-bearing capacity and durability while being light and easy to carry. Weighing only 252g, it takes up minimal space and can easily pass through security checks. Includes a storage bag for convenient transport. Design innovation: This metal lever door stop alarm has a triangular integrated design that utilizes principles of physical mechanics. It directs the force from the door down to the floor, shifting the center of gravity and ensuring stable door holding. The non-slip rubber pad on the bottom provides strong support and maintains stability on various surfaces. Easy to install: This door stop is quick and easy to install and remove in just three seconds. No drilling or tools required. 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 the floor must be between 5 and 25 mm). Security Guard: This retractable alarm door stopper helps prevent unauthorized entry, ideal for use in hotels, during travel, for solo living, or business trips. Provides added peace of mind by detecting unusual movements at your door. Offers reliable protection, helping you feel secure and sleep safely.