The little blue bubble is a pump. There is a little air pocket that you can pump up if you need more pressure. It's like The Pump shoes you know you rocked in the 90's!!
I still haven't weighed myself so I don't know where I am. Can I tell you how much this is driving me crazy?! I want, no I need to know where I am at. I can tell that I am losing, but I would like to know how much and at what rate. I can tell I am losing in my clothes. The capri's I bought in a smaller size are getting loose on me. That is making me very happy even though I have only worn them twice.