1.easy installtion,CE,UL approved

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 head

9.your own design is always welcome