Duo- is Concept is great. Seems promising for tele health. Worked well initially. Short learning curve to optimize ECG and placement. You need earphones to hear heart sounds optimally when listening off your phone.
Unfortunately it died in 3 days and will not charge or turn on. Disappointing reliability. I had trouble with Bluetooth for Core in past as well.
Still waiting on customer service response (to be fair it has only been 48 hrs and my prior experience is that they do provide good customer service)
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