CCAKZ AZ09 Bluetooth 5.2 Module IEM Adapter Wireless Waterproof Ear Hook Extra Long Battery Life Bluetooth Cable for ​KZ ZS10 PRO/ZSN Pro X/ZSN PRO/ZSX/AS12/AS16/ZAX CRA/C12(C pin)

I bought these as a test to see if I would like the style and fit before dropping $80 or more on a good pair. Connection is awesome, regular earbuds don't connect for me from the interference in my environment, these are a solid connection that hasn't failed or dropped out once. They are more comfortable that I would have thought. The battery life is great, like in excess of 8 hours for me. The volume could be a little more as they seem underpowered sometimes. There have been a couple of times that I wished I could turn them up a little more but they were already all the way up. With BASN iem's the sound is fine with no buzzing or hissing in the background. For my purposes I can't justify buying a more expensive pair just for the louder volume. It wasn't like it wasn't loud enough to hear, just wanted a bit more. After more than a dozen pairs of wireless earbuds($30~$120) that wouldn't keep a connection more than 5 seconds without dropping signal these are the best listening experience I've had. Way better than expected.

Works good. Nice range and sounds

Update: I decided to replace the unit. This replacement is working great and I am enjoying using my KZ Z10 Pro with the bluetooth. While walking at the park I noticed the sound dropping on the left ear for a split second, and again the next day it happened again. So far it's very infrequent and doesn't bother me, not what caused it but at those times I was in motion with my phone in my pocket. Battery life has been good, i haven't ran them to low yet, the longest I used them in one use was like 2hrs. The call quality could be better, sounded a little choppy for what I was hearing and I'm not sure how I sounded on the other end.Comfort wise, it felt good, it's not heavy on the ears and it conforms well. When I use my IEMs at work, the dangling wire tends to bother me a bit with the pull in my ear hooks but with these units, it just sits comfortably on my ears.Overall I'm satisfied using my IEMs for more than just work now. I don't plan on using this Bluetooth for calls as much as I do for music and it does well the Z10 pros sound like they are wired.Original review: My left ear hook unit seems to not charge, I lift it out of the case, it turns on and then turns off by the time I securely place it over my ear. Its looks like it's charging when I place it in so i am not sure what's happening. The right unit is working fine and sounds great but I haven't even had a chance to use both together except for the initial setup and one other time after.I've tried resetting them and resyncing, making sure it charged over night, and placing it correctly without moving the charging case. Nothing seems to work and the left unit just turns on and off.One star for comfort because I only worn a single unit.

UPDATE: I finally got in touch with the company, you just have to push your way through Amazon customer service first. I dont remember it being so complicated in the past? They said immediately they'd send a replacement and I just got it in the mail! quick and easy :)Original Review:I bought these with the wired KZ EDX Pro in-Ear Monitor Headphones so I could swap them out between bluetooth and wired. Sound quality is great for the price, I find them comfortable and they dont slip out of my ears when I work out (!!!) I was so happy with these. but after 4 months the right earhook started generating this static scratching sound and now is unusable... I'm not sure what the lifespan on this stuff should be but 4 months seems pretty bad...I feel like they would probably send me a new one if I could figure out how to contact the company? it doesnt seem possible to contact them through Amazon...

Although this is a 78mm 2-pin Bluetooth adapter, it does not fit HEXA!It is very loose when connected to HEXA.However, it does connect to EA500. So, be aware if you want to purchase for your IEM.Secondly, when it connects to the PC, it automatically recognizes it is a hang-free device and a hang-free device has a horrible sound. You have to do a little disable/enable in the Bluetooth setting. And that is a little trouble to do so. But you can definitely find instructions on YT.Finally, it is kind of annoying whenever you need to connect to a phone or PC, you will need to put the IEM back in the box. Otherwise, it won't recognize.Besides all these little things, this Bluetooth adapter is very good. The sound is a little lower than connecting with cable, but if you connect to a large volume IEM such as EA500, that problem is solved perfectly. The sound quality is good.Overall, I am very happy with this purchase.Updated: It is dead in 2 two days with the right ear module not charging. And I already threw the box away, so I cannot return it.Do not buy it, I repeat, Do Not Buy It!!