Alarm Door Stop – A portable security system for industrial doors to prevent unauthorized entry. It can be installed directly on any standard interior door without tools. Once installed, it blocks the door with its powerful displacement, thereby preventing break-ins. Please note that this system is not suitable for carpets or similar surfaces; please read carefully before purchasing. Designed for Commercial Use – This is the pinnacle of portable door stops, designed for emergencies in public buildings, schools, offices, or hotels. The Strongest Materials: After many years of research, we developed this product. The materials are small but extremely strong. You don't have to worry about safety; the lock holds the door firmly in place. In an emergency, the door brace can be easily removed by moving it upwards. User-Friendly – It's easy to use whether you are an adult or a child. Place the door stop with the bottom flange under the door, below the door handle. Adjust the support legs to secure the door stop firmly. Check the door to ensure the door stop is secure. (Weight 400g) Premium Service – Protected against manufacturing defects: We use the highest quality materials and manufacturing processes to provide you with this superior home security device. Your peace of mind is paramount.