... Installation 3. Mechanical limit switch 4.Aluminum base Rolling door opener, roller shutter motor, roll up shutter operator1.It's used for open ... close the rolling shutter of supermarket door, storehouse, cinema, hotel, roll up garage shutter, factory and so on.2.It can be ... Microchip technology in storing code, the remote control security code, up to 20 different transmitters can be stored in the non ...