Features: 1.Time Delay: With door close time delay function, will lock until the door completely stop moving, rather than lock instantly, effectively protect the door and lock from damage. 2.Increased Security: The electric drop bolt lock has 205 levels of security protection, making it a convenient choice for both residential and commercial applications. 3.Aluminum Alloy: The electric drop bolt lock is made of aluminum alloy material, firm, antirust, durable to use, and is impact resistant and wear proof. 4.Compact: Designed specifically for narrow doors, this bolt lock provides a sleek and compact solution without compromising on security, making it an ideal choice for small spaces. 5.Wide Application: Suitable for office buildings, homes, apartments, and more, this lock offers a versatile and reliable access control solution for various security needs. Specification: Item Type: Electric Drop Bolt Lock_x000D_ Material: Aluminum Alloy_x000D_ Size: Approx. 21x4x4cm/8.27x1.57x1.57in PackageList: 1 x_x000D_ _x000D_ ElectricDropBoltLock 2 x Metal Plate 1 x Pack of Screw