Great sound - til it stopped working.
345554
Great sound - til it stopped working.  Can still hear, but mic quit after 4 months. Now it's just a good headphone.
2838152
These sound great (excellent base and treble), sealed to my ears very well, and had a fairly good distance (like across the gym with no issues).  Unfortunately they stopped working about 2 months later after a particularly sweaty workout, so they're definitely not sweat-proof.  They shut off during my workout, and I thought it was because the battery died. But when I plugged it in to charge it, no red charge light in the earpiece.  I left it plugged in to charge for the rest of the day, but it never charged up.

If you just want a set of light-weight, great-sounding blue-tooth earbuds for around the office, house, or light physical exercise, these are hard to beat for the price.  Based on my experience, however, I can't recommended for heavy gym workouts. Perhaps others had better luck.
3711803
I purchased these earbuds in July 2016. I loved them. The sound was great, the battery life was significantly better than other models I looked at, and the price is fantastic.

Then, about 4 months in, the left earbud stopped working. So that was that. Needless to say, I'm really disappointed. So...buyer beware, I guess.
994874
I bought this product back in May and the headphones are not working anymore. No sound comes out of it. When it did work, the sound quality was excellent and made listening the best experience. Like I said, after awhile, the sound quit on me and the headphones are dead. I am going to try to get them fixed tomorrow.
3932348
Great sound and quality but will no longer hold a charge
4503553
I love the sound quality on these-- I use them with Comply Isolation ear tips, and they sound great with bass that's bigger than my past pair of earphones (Brainwavz M1s) but never overwhelming. I was really disappointed to find that today, after about 8 months of (extensive daily) use, the left ear has stopped working completely. Looking at the Q&A section for this product, I see that at least a few other people have also had this problem. That said, I do feel like these are amazing for the price, so I might just buy another pair.
1926914
The sound quality of this is great, especially for such a small, inexpensive speaker.  I can't say whether it is waterproof because although I took it to the pool and river, it didn't actually get wet.  Unfortunately, I can't give it s positive rating because about a month after purchasing it, it stopped working.  My phone bluetooth still syncs with it and a light comes on when it is charging but it won't play any music.  My phone shows that the music is playing but no sound is coming out of the speaker.  I've tried adjusting the volume, pushing and holding all of the different buttons on the device, using a different charging cord, etc. but I can't get it to work again.  It used to work just fine.  I'm disappointed that it only worked for a month.
2115372
I was very happy with the product.  Aside from the fact that I frequently lost the ear-plugs that fit over the speaker, the sound quality was *fantastic*.  Unfortunately, the left ear bug stopped working yesterday.  I use these earphones every day with my iPhone - everyone says the sound quality of my voice doesn't even sound like I'm on a headset.  Unfortunately, I must rate this product a "1" due to the fact that they have stopped working after just over a month of use.
1467300
I used these headphones almost every day for 3 months. I was impressed with their sound quality and comfort, especially for the price, and really enjoyed them. Then, a little over three months after I received them, the left earbud stopped working in the middle of a gym workout. There were no exterior signs of damage, and they were not hit, crushed, pulled, or anything of the sort that would explain their failure. I'm very disappointed they didn't last longer.

UPDATE: COULAX saw this review, contacted me, and gave a full refund for the headphones. I'm giving another pair of COULAX headphones a try. Hopefully these will last longer.

Summary: great sound quality and battery life initially and great customer service, but concerns about durability of product.
1138893
Good sound, for small speakers, but this item stopped working after approx. 7 months of use.  Could not recharge the mini speaker.
4619953
For the price, the earphones were exceptional. They were comfortable and it worked really well. It worked perfectly for my apps like Talking Carl or I am T-pain, until one day. I have had these earphones for about 6 months, but one day it just stops working. There was no way to fix it, so now it is in the trash.

Overall review: The earphones are excellent to use, just hopefully they don't suddenly stop working like mine.

Sound Quality: 4/5
For iPod Apps: 4/5
Lifetime 2/5
Price: 4.5/5
2594217
The sound was great when the speaker was functioning. It no longer charges after 6 months and I am hard pressed to find information on how to contact the manufacturer for assistance.
1652712
These had great comfort and sound quality. However, I got these on the 25th of March, and as of today, April 16th, they no longer work. About a week after I got them, the left ear speaker went out and that wasn't enough for me to go through the hassle of returning them. And now today the right speaker stopped working.  I listen to alot of audio daily so perhaps that contributed to the short life span.
1827018
I have gone through two sets of these earbuds and both just randomly stopped working. It's a shame because I really liked the sound and they fit my ears perfectly. I cannot figure out why they stopped working, it was totally out-of-the-blue. Fortunately, the first pair was still in the return period. The second pair seemed to last a little longer, but that may be due to the fact that I wasn't using them as much in the Fall-Winter time.
1306454
I really enjoyed these headphones until they stopped charging. When I plug them in, they show the charging light and then it goes out after a few seconds. Other than that, they are spectacular for music and PC gaming. Nice crisp sound. I haven't used the mic, but the sound quality is superb.
Over all, it is a good purchase while it lasts.
4050828
I am so glad I ordered this! The sound is great, particularly in the water, and after a month everything continues to work fine. I am thrilled to be able to listen to my favorite tunes as I swim! Update: After using the iPod for 1-3 x/week since I got it in early July, it stopped working last night (August 18). I've contacted Underwater Audio and I'm waiting to hear back from them.
2834766
Was great for about 6 months. Then out of nowhere the speaker stopped working. At full volume I have to hold it right next to my ear to hear anything. I would have tried to get a replacement if it hadn't been so long since I bought it. Other than that, it worked great, when it worked.