Hello & Welcome to Just Answer,
Sorry to hear of any issue with this device.
May I ask if you HAVE the electronic (PDF) version of the manual - on your computer - and a printer to actually print out the information?
If not, I have a link to the PDF manual for you below.
Click here --> http://static.garmin.com/pumac/vivosmart_HR_OM_EN.pdf
The information you are looking for is on page 2, left column, under the section TITLED "Activity Tracking and Features".
I will also send an ENLARGED image of that section - as an attachment.
I hope this helps. Please let me know if you have any more questions.
If this has helped answer your question(s), please take a moment to rate MY service level (5-star is my goal) so that I get credit for my time helping you with this question.
You should see some "stars" (and SUBMIT button) to do that, but please let me know if you do NOT see them (you may have to REFRESH your screen) or can not use them.
Thanks, ***** *****