Is it a FanTastic vent fan? If so, that sensor looks like a little circuit board. Almost like it doesn't belong there and somebody tagged it in place with a screw. I didn't trust ours, even though it never really failed us. I have a MaXXAirII cover over it. Then I found the auto feature never got out of the right side of the bed when I turned the battery disconnect ON after storage. I took a wire off the motor and put a couple washers under the knob to keep it from engaging the electric gearbox. Much happier with it as a manual vent.