High-quality material: High-quality ABS plastic shell and 304 stainless steel wire, anti-oxidation, corrosion resistance, high and low temperature resistance, long service life. Winding roller: There is a turbine spring inside the automatic door closer, which uses the principle of turbine power to pull the cable back, so that the open door is pulled out and closed. Product function: Avoid getting up at repeatedly when studying and working, and open the door to improve study and work efficiency. Prevent mosquitoes and flies from entering the room and prevent kitchen steam from entering the living room. Applicable places: Automatic door closer very suitable for home, light office, shed, ranch, home office, etc. for doors or doors with a slightly stronger closing force. Suitable for most doors: Our punch-free automatic sensor door closer is suitable for most doors such as doors with a slightly stronger closing force, doors that open left and right. right, wooden and metal doors,