I have used it when I ran the other day and did 1.5 miles and it didn't fall out or loose signal at all.. I even called my hubby when I ran because I wanted to check on him and he could hear me clearly.
I even used it today working out with weights and it worked fine. I will be using each time I do work out and when I am working from home as to call and talk to others and build relationships and contacts.
If you are wanting to purchase this item you can go to Amazon: https://www.amazon.com/Bluetooth-Headphones-Comsoon-Invisible-Hands-free/dp/B01M6D5XKT/ref=sr_1_1?ie=UTF8&qid=1482245634&sr=8-1&keywords=bluetooth+headphones
It is a great item to use for working out as well as working from home.
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