CONNECTION defines how electrical connection is made to the sensor. Examples are integral connectors (no wires showing), free end wires (individual wires without any connector), pigtail connectors (connectors on a short length of wire) etc. Some housings don't have integral connections, you might need to go back to the housing page and look at alternatives. Compare the drawings and click the one that shows your best choice and you get to this sensor's product page with ordering information.