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These Liftmaster chain drives are noisier than the belt drives & virtually bullet proof! I'm a retired Architect & I've always spec'ed Liftmaster on my Even if you don't have children at home, there is still the risk that the manual door will come crashing down or something or trap fingers. That's why automaticMonitors up to 4 garage doors with extra sensors (sold separately). Red light flashes on base station to indicate the garage door is open, green confirms that Safety Reversing Sensor. Safety Reversing Sensor. Gap between floor and bottom of the door must not exceed 1/4" (6 mm). Vertical Centerline of Garage Door.