There is an anti-slam door alarm. It will alarm if you do not close the door on time. After the door is closed, it is automatically locked.The state of the lock has sound and light prompts, and the door is closed without collision, noise, and environmental protection. The integrated structure design has high anti-destructiveness, reasonable circuit and mechanical design, easy installation, simple operation, and durability. Suitable for homes, offices, schools, hotels, factories, warehouses, etc. Specifications: Condition: Brand New Color: Silver Material: Zinc Alloy Input voltage. 13 x 10.5 x 4cm/5.1 x 4.1 x 1.6in Package Weight: Approx. 1 Intelligent Operation Remote Control(Including battery). Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Instead of leaving negative/neutral feedback or opening a dispute. Our listing price includes the value of goods, packaging cost, and export. Please check with your country's. We will reply your message within 48 hours. If you do not receive our reply within 48 hours, pls. Post a message again because sometimes our message system may block some emails. If you are satisfied with our service, pls. Our aim is to provide Level Customer Service, your recognition will encourage us greatly and serve you better. We strive to keep all our customers satisfy. We will do our up most to exceed your expectations in customer service, communication and dispatching of your orders.