What is this? Multifunctional automatic door closer which can keep the residential door interior door and commercial door automatically closed. Suitable for home use small office and home office. Is there any advantages of the product? Self-adhesiveness no need to perforate installation high temperature and aging resistance firmness no damage to the wall and easy installation. How to use it? 1.Clean the position which you need to stick. 2. Tear off the rubber protective film install the automatic door closer. What should I notice? Tips: To install the door closer the tape s viscosity is strongest after 24 hours.