UPDATE: I have the broken clock returned and bought a new Sport Watch (same type). Unfortunately, now occurs in this model the same problem with the moisture on the display - and still more massive than the first clock. At the first clock, the moisture has entered the bottom right under the protective glass - now mists up the display of the lower left and right lower corner of the screen, so I can hardly read the display in low temperatures. I find that very annoying.
I'm actually a big fan of the Nike Plus system - but what should I do now? - The device again swap, to regain a defective device ???