Light curtain for doors, rapid raise door, garage door, with black aluminium and polycarbonate cover. Optical synchronisation, the ray system is with gradual shut down, managing from the control unit with encoder, the last ray can be considered as limit switch. This light curtain works with crossing or 20 parallel rays each meter, obstacle detection even for small objects. The range up is adjustable with trimmer, tamper contact available. Composed of Tx and Rx.