So I was washing my bike and the gps unit was exposed and I noticed the casing was missing. It was on the ground but the electronic chip was now exposed. There is no gasket on the housing, and too boot there was no adhesive to keep the two pieces the case together which I found odd. I know its not waterproof let alone dust proof because there was dust inside the housing. Will have to get some crazy glue. Odd considering instructions state the unit functions better if exposed. :( It was exposed alright. No gasket and dust inside unit. Fortunately I put the sensor back in and closed the case and receiving GPS.