... of automatic door ,to supervise the door of operation . beam sensor,General international optical lens design, and good focus, ... distance, the power of a shot long life. A single-or dual-group lens group transceiver connecting points of entry ... one can control, Control can also be a double-beam. Block the light trigger, the output signal can contact ... D)control:123mm(L) × 50mm(W) × 32mm(H) beam sensor