Plan to purchase new device once a year
I do not have much good things to say. I have used Heartmath since 2018 and during this six year. I purchased four devices each of them lost it some over year some less than a year the devices are very expensive and they almost doubled in price by now, but the quality of the device and the quality of the app are very low and unless you’re ready to pay 200+ dollars a year every year do not consider purchasing this device