I don't know the name of it but supposedly the insurance wants it - I cant figure out why they would want it so I'm skeptical. I have to go next week and pick up some box that I guess I attach to myself somehow, then turn my 02 off and try to sleep without it. I realize they are trying to see is my 02 goes low only when I'm moving around but why would the insurance Co want to know? It cost them the same, the price is no different if I use it at night or not. I'm in the final stage of copd my test results are horrible so I know it is not so see if I really need it.