Electric Bolt Lock 
1. Easy installtion 2. Scope of application: application all type of door. No frame door can choose bracket. All swinging doors 3. Fail-safe operation 4. Temperature rating: -40c-100c 5. Different series different sizes 6. Accessories optional: access control, power supply, door closer, ect 7. Delay function: the time delay is adjustable 8. With key & mechanical lock 9. Your own design is always welcome