Finally got around to giving me the promised refund although it took social media posting to get action. Heard form their "Happiness Engineer". Nice woman. We'll see if refund is actually credited. Product is subject to what seems to me to be connectivity issues. The Kardia sensors don't seemingly have that issue. The Sonos "dry skin" contact problem that causes them to include a gel in the product packaging is peculiar and not mentioned in their promotion. Strange and a misleading. Nicest thing I can say is that they are trying. Perhaps subsequent versions of this product will be better. Dr. Peter Sprague