After the 3rd exit, I could not control the stall call / range change (middle button). Later, it was the volume. Then more sounds in the left ear. To see, I dismantled the command completely corroded inside. There is no joint or sealant on the edge of the control. To summarize, there is no seal on the central part (control) which makes the helmet unusable. FYI, I am at all served me 3 months. Certainly, in a tropical country but still, Sennheiser had become accustomed to better.
