That's what I thought was a little strange. How Pourous is it to b concerned about a little moisture? Not to mention the cleaning of it with the mini USB port having no cover. All these battery powered machines n power supply seem like a good idea but no one has figured out a way to truly make them work. The idea of the watch is cool, esp with a pen machine but how it truly works is the question. The videos posted have them wrapped but there's no real reviews online. That's y I was curious and figured it would b a good topic. Thanks for your thoughts.