... Mounting Installation 3. Mechanical limit switch 4.Aluminum base Rolling door opener, roller shutter motor, roll up shutter ... operator1.It's used for open and close the rolling shutter of supermarket door, storehouse, cinema, hotel, ... No.SpecificationER1002Side rolling door opener(Mechanical limit switch)ER1003Central rolling door opener(Electronic limit switch)ER1004Side rolling door opener( ...