... used for open and close the rolling shutter of supermarket door, storehouse, cinema, hotel, roll up garage shutter, factory and so on.2 ... control:2pcs, HCS301 code hoping or rolling code, 4 channelsItem No.SpecificationER1002Side rolling door opener(Mechanical limit switch)ER1003Central rolling door opener(Electronic limit switch)ER1004Side rolling door opener(Electronic limit switch ...