Looks like a sensor for remote control to the front maybe or a hidden camera
Or even maybe a sensor for zone 2 heat or AC but hey are not usually that high
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Steve and Joy
2014 Itasca Suncruiser Where we are now
That should be an infrared repeater to allow control of the DVD player up front from the bedroom. You should find the other end of it adhered to the bottom of the DVD player and sticking up in front of the 'eye' on the player.