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

KZ AZ09 Bluetooth 5.2 Module ReviewLooking to cut the cord on your IEMs without emptying your wallet? The KZ AZ09 has got you covered. This nifty gadget turns your favorite wired IEMs into wireless ones, all without breaking the bank.Design & ComfortThe ear hooks are lightweight and fit comfortably, even during long listening sessions. Plus, they're waterproof, so a little sweat or rain won't slow you down.Sound QualityPair these with your go-to IEMs, and you're set. The Bluetooth 5.2 connection keeps things stable, so you can enjoy your tunes without interruptions.Battery LifeBattery anxiety? Not here. These modules keep the music going for days on a single charge.Bang for Your BuckWhy shell out big bucks for wireless IEMs when the KZ AZ09 offers a budget-friendly alternative? It's a smart way to go wireless without going broke.The Bottom LineThe KZ AZ09 is a solid pick for anyone wanting to ditch the wires without spending a fortune. It's not perfect, but for the price, it's a win.

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!!

I bought these paired with the KZ ZS10 Pro's, and while the sound quality is VERY good for the price, they fit over my ears comfortably, and the battery lasts a good long time and a case that is durable and can fairly quickly recharge the adaptors, I've noticed a couple of issues that've compounded over time with the now MULTIPLE sets I've purchased1. This may be from my constant usage, but the charging case has a tendency to just STOP charging the earbuds, and because the case doesn't automatically keep them shut off when they're stored, the earbuds stay connected to my phone and LOSE charge, which is for one, really irritating when I want to switch to my wired headphones, but also frustrating for when I need them for extended periods of time.2. There's two distinct versions of these Bluetooth adaptors ("B pin" and "C pin"), and even though iem's of one type are (at least from what I could find) impossible to come by, they're still being sold? I made the mistake of buying the wrong one (B pin) during I time I had very little free money, and without a way to return/refund it at the time that was $35-ish wasted. The Amazon listing is no help either, as all current iem's compatible with ONLY C pin adaptors are stated to be compatible with BOTH when they're NOTIn conclusion, they're very good (if you're willing to put up with the issues), and they've treated me well (mostly), but I cannot wait until my financial situation finally begins improving so I can finally move on towards better (and preferably over-ear, because two straight years of earbuds have damaged my ear holes) headphones and continue my journey with The Various Things I Like Listening To™️