You can use the clutch key to open and close the door manually when the power is off: there is also a way to open and close the door when the power is off. When the door encounters obstacles during opening and closing, it can automatically stop or rebound: very safe. You can set the automatic closing time: to make your life easier. Reliable electromagnetic limit, easy to adjust.
The built-in maximum motor running time (MRT) can be adjusted to provide multiple safety protections. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business.A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it's non-workdays, please kindly be patient and wait till Monday. This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Garage Doors & Openers\Opener Systems". The seller is "yullstore" and is located in this country: US. This item can be shipped to United States.