1. Fail-Safe: Adjustable fail-safe (Power to lock)

Adjustable to fail-secure (power to open) for high-security places. Adjustable to fail-safe (Power to lock) for public places.
Adjustable to fail-secure (power to open) to achieve long unlock state function.

1. Built-in oval cylinder as unlocking the device 

Use of an oval cylinder to unlock when a power cut occurred or during emergency
Built-in photo couplers door open push button input contact. The door will lock again automatically when door is not open within 5 seconds