Keep open in the opening range of 90 ~ 100 : the automatic door closer with locking function. If the door opening area remains 90 to 100 , this door closer with shock absorber can leave the door open at any angle where your force stops. To meet your needs, you don't need any outside force or additional door stopper to keep the door open. And the opening can be easily loosened by just pulling the door part 0 ~ 90 .Buffer and automatic closing function: the opening area of the door remains 0 ~ 90 and 100 ~ 180 , the door closer automatically and silently closes the inner and outer door. You don't have to shout close the door. Compared with the clip door closer, the door closer automatically reduces the closing speed when the door between 0 and 15 so that the door closes slowly and the wall is not damaged. Closing the door will no longer be tedious.Small Size, Strong Function: This hinged door closer incorporates automatic door closing, damping, holding function and hinges. Replace the stock hinges with this invisible door closer to remove door, floor and wall stops, dampers, interior door closers and door clips. Restores the original beauty of doors, floors and walls and reduces their load.A friendly partner for the family: Compared to conventional door closers, the door closer has lower pressure on the door opening, so that there is no difficulty in opening the door. It will be a sympathetic partner for the elderly and children, and it will be better suited for family use. The hydraulic door closer is hidden in the hinge, so that it does not harm the elderly, children. And it won't damage doors, walls, floors.Widely Used: This exterior door closer is made of high quality 304 stainless steel and filled with hydraulic oil. Suitable for door weight 30-40kg. This outdoor door closer can operate normally in extreme environments. This spring-loaded door closer is a non-manual door closer. It can therefore be used for left and right doors. Very suitable for hinged doors, interior doors, exterior doors, garden doors, front door, fly screen, glass doors, bedroom or balcony doors.