With electricity power is on, the lock will work to protect the door unless the opening force is more than 300kg.

1. Principle: When the electricity power is on, the lock will work to protect the door unless the opening force is more than 180kg. When the ppwer is off, the door will be opened.

2. Advantage: Without mechanic defect

3. Suitable for: wood door, iron door, glass door, building interphone considering the safty.

4. Installation: insert style and hanging style

5. 3-year-warranty

6. Extra stand: U shape, Z shape, L shape.