Keep the door open within a range of 90-180 degrees - when your opening angle exceeds 90 degrees, this door closer can keep the door open at any angle. You don't need to use external force or a door stopper to keep the door open. If you prefer well ventilated rooms or need to frequently move goods, this will be your best choice. You just need to pull the door within 90 degrees, and it will automatically close. High quality and adjustable speed - The hydraulic door closer is made of high-quality aluminum alloy. It can automatically and quietly close the door. Improve your quality of life. You don't need to shout 'close the door' anymore. The door closer has two valves that independently control the closing and locking speed. You can control the closing speed as needed. Easy to install and meet quality standards - The door closer comes with a detailed and clear installation manual and installation video. Easy and smooth installation. The hydraulic door closer has passed CE, UL, 3C certification and fire testing. Manufactured according to European production standards Widely applicable: The No. 2 door closer spring is used for doors weighing 25-45kg with a width of 750-850mm. Autism is suitable for left and right doors, wooden doors, metal doors, residential and commercial doors, exterior/interior door closers, fire doors, hotels, apartments, and warehouses.