The door opening range is 90°~100° and stays open: automatic door closer with blocking function. If the opening area is maintained between 90° and 100°, this door closer with buffer allows the door to open at any angle as long as your force stops. To meet your needs, you don't need external force or additional suction to keep the door open. Simply pull the door area from 0 to 90° to easily resolve the opening position. Automatic buffered door closing: the door opening range remains at 0°~90° and 100°~180°. The door closer automatically and quietly closes interior and exterior doors. You no longer need to shout "close the door". Compared with the door closer clamp, the door closer automatically reduces the closing speed when the door enters the buffer zone of 0°~15°, allowing the door to close slowly without damaging the door lock and the wall. Closing the door will no longer be boring. Small size, powerful function: This door closer hinge integrates self-closing, damping, holding, and hinge functions into one. Replace the original hinges with this invisible door closer to remove doors, floor and wall stops, dampers, interior door closers, and door clamps. Restore the original beauty and lighten the load on doors, floors, and walls. Family partner: Compared with traditional door closers, soft-close door closers have lower door opening pressure and no difficulty in opening the door. It will become a friendly partner for the elderly and children, and is more suitable for family use. The hydraulic door closer is hidden in the hinge and will not harm the elderly or children. And it will not damage doors, walls, or floors. Widely Used: This exterior door closer is made of high-quality stainless steel and filled with hydraulic oil. External door closers can work normally in extreme environments. The spring door closer is a non-manual door closer. Therefore, it can be used for both left and right-hand doors. Perfect for swing doors, interior doors, exterior doors, garden doors, entrance doors, screen doors, glass doors, bedroom doors, and balcony doors.