Turned out to stop working
342371
These were awesome when they worked then they stopped working so they suck will never buy these again
2180980
Stopped working after about 10-12 times I used it (or about 25 hours of work) - same problem as reported by dozens other users.
4444587
I really liked this when I bought it.  then it stopped working. The pumping of the water seem to stop all of a sudden. Was going to toss it when I decided to give it good cleaning and some adjusting and shaken up (threaten to throw it in the trash) and just like that he decided to work again. I pretty happy with this
1138008
Worked for awhile, but then not effective, don't bother.
227571
Worked great for two months and then simply stopped working.
1548995
Stop working about 3 months after purchase... Unfortunate because it was just what I was looking for when it did work.
3930345
Worked great for about 2 months, then stopped working completely.
649764
Was enjoying my wireless charger and then one day it just stopped working.
1344256
Only work a few times and stop working. Don't buy this one.
4725640
I had used it almost everyday until it recently stopped turning on. Very dissappointed.
2757830
Worked well for three months, and then it stop working at all.  Unfortunately, could not return/exchange it after that.
1546099
Worked really well for a few months, then suddenly stopped
3146302
Stopped working on some of the computers we tried hooking up to it.
862110
Overall these headphones were very good while they worked. They all of a sudden stopped working during a jog after a full charge. They now won't take a charge or turn on at all. Will try to contact Kumu.
1041538
It started out doing it's job and then stopped working. I replaced it with a card reader that was multi-functional and am very happy with the change.
4677973
Looked and worked great, for a while anyway. Now it doesn't work anymore. Does not turn on.
1238888
This stopped working after 2 months- it's not eligible for return so I'm basically out the money.