A:AnswerThe left one is the primary and the right one is the secondary. The primary (left) can be used by itself. The secondary one (right) can only pair to the primary one (left) and can not be used by itself. This is typical for all brands of "True Wireless'' in the ear headphones such as these.
A:AnswerThey don’t noise cancel, but it’s also a good idea if you mess with the eartips that get the most secure fit to ensure a proper seal. That way, you’ll get as much sound to stay around and in your ear.
A:AnswerYes, rechargeable but battery not great. Hard to get them to actually charge while in case (not sure why) and they won't hold their charge long.
A:AnswerI had this problem & I couldn't get them to pair no matter how many videos & walkthroughs I tried. I ended up fixing them by just putting them back in the box and resetting everything thing. They went back to normal themselves. I hope this works for you. It certainly did for me.
A:AnswerUnfortunately, only the right earpiece works during phone calls. I did not like that feature at all!!! The Power Pro Beats were much better with that feature.