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 cell batteries, it offers an ultra-long standby time, providing lasting peace of mind.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. It comes with a dedicated storage bag for convenient portability.Design innovation: This metal lever door stop alarm has a triangular integrated design that effectively applies principles of physical mechanics. It directs the force from the door down to the floor, shifting the center of gravity and providing stable door holding performance. The non-slip rubber pad on the bottom ensures strong support and stability on various surfaces.Easy to install: This door stop is quick and easy to set up, taking only seconds to install or remove. No drilling or tools required. Simply place the door alarm in the gap between the door and floor and tighten the screws clockwise. (Note: the gap between the door and floor must be between 5 and 25 mm.)Security guard: This retractable alarm door stopper helps deter unauthorized entry, ideal for use in hotels, during travel, for solo living, or business trips. When used at home, it provides added awareness of disturbances near the door. It acts as a reliable security aid, helping you feel safer and sleep more peacefully.