Didn't work on me
I wanted this to work. Tried hard. Even contacted the company to learn if I was doing something wrong. I could not get the unit to display a pulse. I know I have one but the monitor would not display it. I had my wife put it on and it started working on her. I took it back and no pulse. So, I know  the unit works but you should be aware that for some people it just won't register. In my case I have an unusually low pulse and perhaps that is a contributing factor. I have to concur with the other posts about the terrible lack of helpful instructions and the funky wrist band clasp. Seller was good about taking the unit back and providing a refund.
Rating: 2 stars