If you sell a device that monitors heart rates, and that device doesn&#x27;t properly monitor heart rates... then you need to fix it or stop making it. I don&#x27;t see why that is unfair?<p>If I buy a desk lamp and it doesn&#x27;t work reliably then you sold me a lemon and I want my money back. It doesn&#x27;t matter why I need light on my desk.