1. For different buildings, you can choose to install the doors inside or Outside or in the middle. It will rolled together to the upper part of the door, occupying less space of garage, and can prevent the mud, dirt and snow or rain from coming inside the garage. 2. It will return automatically when unexpected trouble happened in case that the door moving down to damage the vehicle and man, so that vehicle and man can pass without difficult. 3. The door is firmly and equipped with automatic alarm device, preventing against robbery or burglary, continuous alarming, ensures the safety of residence. £¨optional£©