and high quality. Secure mode: The door lock while supplied with power, and unlock without power. Especially suitable for wooden and metal doors. Made from and high aluminium alloy material, ensuring long-lasting use. Special circuit design allows the door to unlock only when power is cut off. This product is designed for enhanced security and stability, featuring a fail-safe model that locks when powered on and unlocks when powered off. It includes adjustable time delays of 0, 3, or 6 seconds, making it versatile for various applications. The design minimizes external interference, providing a reliable locking mechanism for both wooden and metal doors. Color: Silver Material: Aluminum Alloy Specification:A:Power failure unlocking Package Contents: 1 * Electric Drop (Open when no power) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.