Provide your gate with added safety with the Mighty Mule photo beam sensors for Mighty Mule swing and slide gate openers. Photo beam sensors help prevent the gate from closing when an obstruction is in the path of the sensors. These sensors can be installed inside or outside your gate with included mounting hardware. Additional low-voltage wire (RB509) is necessary for installation. The photo beams are required to be connected to each other, under the driveway is preferred and one photo eye requires to be connected to the operator location.