operated protected with internal thermal switch wide range of model available from 3 mtrs to 10mtrs also available under ground / for wide pillar & for outside opening smooth noiseless function easy manual over ride incase power failure adjustable torque ip level 54 for safety auto stop & auto reverse facility with advance control unit in built control unit with internal thermal switch model available from 400 kg to 2000 kg capacity up to 10 meters in built control unit with internal thermal switch.