Loud sound: 125dB alarm sound. When the door is opened, the alarm will immediately sound an alarm to deter and scare, help wake up/remind the landlord or tenant, help stop the intruder, and can notify the neighbor for security protection. Non-slip door stopper: When the door stopper alarm is in the "closed" state, it can be used as a common damping rubber-based door stopper. The suction cup is designed with shock-absorbing primer, which has strong adhesion and firm without moving. Stainless steel: Stainless steel door obstruction surface, durable and pressure-resistant, and does not will not damage the alarm due to strong external force. Whether it's tile, concrete or hardwood, these door wedges will prevent your door from moving. Portable: Small and exquisite, easy to carry, convenient for temporary fortification of the hotel. Very suitable for bedrooms, hotels, apartments, dormitories, front doors, etc. Feel comfortable when traveling or working alone. Easy to use: The door block can be used when the battery is installed, and the operation is simple and convenient.