hydraulic hinge invisible hinge

1. Automatic stop function when open beyond 85 degrees with closing and locking speed control; 2. Automatic closing from 170 degrees with adjustable closing and locking speed; 3. Keep the children away from dangerous when the door close suddenly; 4. Pretect your lock&door won't be demage when the door close strongly, 5. Good looking than other door closer; 6. Speed adjustment; 7. Force adjustment 8. Small packing save 2/3 logistic and warehouse storge fee; 9. Easy installtion-1/3 installation charge compare with conceal door closer; 10. Can reset the function when you need second installation; 11. Can be split-the only one manufacture have this function.