And which vital sign is going to help you? Pulse-not really, you'll know if your pulse is a problem if you start having palpitations, chest pain etc. Blood pressure-not really either, its really symptoms that matter not a reading. Also, Bp probably won't be able to be measured using this watch. Hmmm temperature, again fairly useless. This may be good for triathletes, marathon runners etc, but they don't buy millions of devices. It's a fairly small population (I would know, I'm one of them, and I'm also in the medical field)