Currently using the ear piece and let me tell you it's great i charged it once and it's still at 100%. Been using it for 3 days on and off of course but when using it i use it for about 1-2 hours. I definitely recommend this buy, of course the sound isn't there and i wasn't looking for sound i was looking for one ear open and the other semi open to hear my surroundings and so far no complaints. Phone calls sound clear and your voice does sound good must speak up a little but not too bad of normal voice with a hooded sweater doesn't really catch your voice but openly voice sounds clear. It's very comfortable and i wear glasses so this was a plus for me because the headphone doesn't go inside your ear either so overall great buy. 10/10 recommend.
