DC12V Fail-Safe Electric Mortise Lock with Vertical Drop Bolt - Automatically unlocks during power loss to ensure safe egress in emergencies, meeting fire code requirements while providing secure locking when powered. Seamless Integration with Standard Access Control Systems - Works with RFID card readers, PIN keypads, biometric scanners, and third-party controllers via standard wiring, making it ideal for retrofits or installations. Customizable Unlock Duration via Time Delay Setting - Choose from preset hold-open times (e.g., 0/3/6/9 sec) to prevent tailgating, reduce door slamming, and avoid repeated triggering-enhancing both security and user experience. Heavy-Duty Metal Housing for High-Traffic Environments - Built with reinforced internal components and wear-resistant materials to withstand frequent use in offices, schools, server rooms, and commercial entrances. Universal Fit for Wood, Metal, and Framed Glass Doors - Compact mortise design fits standard door prep; compatible with inward/outward swing doors when installed with appropriate strike plates or brackets. Color: As Shown Material: Aluminum Alloy Package Contents: 1 pair of lock 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.