JAMA Research Letter February 15, 2022 This study uses data from the publicly available Medaval database to determine the number of upper arm cuff and wrist cuff blood pressure measuring devices sold globally as
For $4 I would say just getting the message and alerts is well worth it, plus being able to turn my wrist and see the time is nice (which of course you can do with any watch but hey, even some standard watches are more than $4) but would I have purchased it for a higher price...