I'm very happy with this watch:
"Heart Rate Monitor with Running Pedometer Step Counter Sleep Tracker for Women Men with iPhone & Android"
Battery life is close to 18 days. Amazon price ~55 USD.
It seems that BP is measured by processing heart rate similar to the method described in US 200901 63821A1 patent.
It seems that BP is measured by processing heart rate similar to the method described in US 200901 63821A1 patent.