Feature:1. Sturdy and Aesthetic Design: Crafted with an aluminum alloy lock body, making it both robust and enduring. Its attractive appearance complements various door styles, ensuring both security and aesthetic appeal for your premises.2. Fail Safe NC Mode: This lock features a Fail Safe NC mode, where power is removed to unlock for enhanced security. When power is applied, a red light indicates an unlocked state, while a green light signifies the lock is engaged.3. Time Delay: Operating on DC12V 24V, the lock is immune to external interference and offers an adjustable delay timer. Users can preset the delay time to 0s, 3s, or 6s according to their needs.4. Application: It allows for easy installation on wooden, metal, fire doors, and more. The lock can be operated via buttons or remote controllers (not included), providing convenient access control.5. Testing: Please connect the red wire to the "+12v" of the 12V 24V power supply and the black wire to the "GND" of the 12VDC power when testing. This ensures dependable function.Specification:Item Type: Electric Drop Bolt LockMaterial: Aluminum AlloyWeight: Approx. 495g / 17.5ozOperating Voltage: 12V 24VCylinder: Diameter 12.5mm / 0.49in, Extension Length: 15mm / 0.59in.Package List:1 x Lock Upper Part1 x Lock Lower Part1 x Instruction Manual8 x Screw