... 2,Convenient for customers. 3,Artistic. Automatic sliding door: --Anti-clamp function to make the mechanism more safe ... function keypad: always open, half open, exit only, lock, normal open. --The half open situation can be adjusted ... open, 1/4 open, and so on. --The door's working time can be adjusted, 3 functions: ... , access keypad, security sensor, fire alarm... automatic door Sliding door operator