Actually it&#x27;s quite unlike car parts breaking.  Car parts have infant&#x2F;random failures and wear-out failures. These kinds of failures are usually a very small percentage of the total number of devices shipped.<p>Fitbit&#x27;s HR monitor fails to provide accurate readings whenever you move on almost everybody.  What they don&#x27;t do is advertise that you have to be still to get an accurate reading.  Fitbit is marketed in such a way as to make you think it tracks HR during motion, I&#x27;d say it&#x27;s not the same as a car parts that break at all.  It&#x27;s more like lying by omission.