I have got a couple of running watches but neither of them could monitor my heart rate and blood pressure. The instructions with the Band are pretty basic but I used the FAQ online to work out how to turn it on (you hold the button on the front down!).
The band links up to your smart phone with the Wear Fit app. So not only can you monitor various health related measures (heart rate, blood pressure, blood oxygen, fatigue, sleep and steps) but also have ongoing tracking and analysis:
I have to say that at times I have been freaked out by readings of high blood pressure! As I didn't check against a more traditional measurement device I don't know whether they are accurate are not... Good to be aware of the possibility that mine us too high though.