Like @truthsfinder already said despite the need to do have done a emergency course in many fields of live, like on work or before you do your drivers license many people do not know anything about CPR or any emergency tactics and adding up to that there are some countries like the U.S. where you can held accountable for in case you do something wrong (with is completely BS in my opinion and just leads to people with doubts about should they help or not). I think this is a nice gadget that really can save lives of course but it is not the solution for this problem at all. I personally would suggest mandatory courses once a year at work and at schools to keep the skills up and fresh. To be honest I'm not sure if I would be able to do a correct CPR if necessary since my last course was at least 5 years ago and I'm sure all know how this courses go you just sit there do a little exercise from time to time and wait until its over.