... shutter operator1.It's used for open and close the rolling shutter of supermarket door, storehouse, cinema, hotel, roll up garage ... control battery: 12V /27ARemote control:2pcs, HCS301 code hoping or rolling code, 4 channelsGross Weight:12.8kg/ctnFeatures:1. Easy operationto ... .7. Photoelectric beamthe opener has an input for a photo electric beam to be connected for an extra safety protection.