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Position the safety sensors, which typically consist of a sending unit and a receiving unit, near the bottom of the garage door tracks. Mark the desired height, usually 4 to 6 inches above the garage floor, for safety compliance. Drill pilot holes and securely fasten the sensor brackets to the garage door frame or tracks using the provided screws and a drill/driver. Insert the sensors into their brackets. Route the low-voltage wires from each sensor neatly along the wall and up to the motor unit. Strip about 1/4 inch of insulation from the ends of the wires and securely connect them to the appropriate terminals on each sensor using a screwdriver.