photo cell,is made of one control mode and two eyes,act ... of automatic door ,to supervise the door of operation . photo cell,General international optical lens design, and good focus, controlled reasonable ... be a double-beam. Block the light trigger, the output signal can contact the flexible adjustment of contact delay time. A ... )×13mm(D)control:123mm(L) × 50mm(W) × 32mm(H) photo cell