Loud sound: 125dB alarm sound. When the door is opened, the alarm will immediately sound to deter intruders, help alert the landlord or tenant, assist in stopping unauthorized entry, and notify nearby individuals for added security. Non-slip door stopper: When the door stopper alarm is in the "closed" state, it functions as a standard damping rubber-based door stopper. The suction cup is designed with shock-absorbing material, providing strong adhesion and stability without movement. Stainless steel: Stainless steel door stopper surface, durable and pressure-resistant, designed to withstand strong external force. Suitable for tile, concrete, or hardwood floors, these door wedges help prevent door movement. Portable: Compact and lightweight, easy to carry, ideal for temporary use in hotels. Suitable for bedrooms, hotels, apartments, dormitories, and front doors. Provides peace of mind while traveling or when alone. Easy to use: The door stopper alarm is ready to use once the battery is installed. Simple and convenient operation.