Roller Side Shutter Motor Central with Control Remote with Safety Brake 1. Separate circuit control ensures the security 2. Safety brake, accurate limited control positioning, with double limit switch protection, prevent door over roll-up 3. UPS automatic system is available. No bother of power failure 4. Can work with remote controller 5.Easy to install, easy to maintenance and long useful life make dimension of olin shut er door pipe diameter( choose 4 inch,5 inch, 6 inch). motor bracket system according to your request.