CCA KZ AZ09 IEM Bluetooth Adapter, Bluetooth 5.4 Module, Wireless Waterproof Ear Hook Extra, Long Battery Life Cable for ​KZ ZS10 PRO/X/2, ZSN Pro/X, AS16 PRO, Zax,ZAR, CRA/C12(C pin)

Another great purchase to write about! I work around our property every weekend and being a music lover I always have ear buds in so I can listen to tunes while I work. The problem is apparently my ears are misshapen in some way that makes every ear bud I've tried not seat correctly so the buds fall out of my ear. Anyone who constantly has to readjust or push their earbuds in can feel me on that point. I wanted a quality ear bud that fit securely and wouldn't come loose as I worked - and this product didn't disappoint. I will say that being Chinese made, it has some funny quirks - it sounds like the lady announcing that the device has connected says "Connectate" instead of "Connected". I don't really care about that though - all I care is that the sound is good quality and the buds stay firmly in my ear. This product did both very well and I'm loving not having to take my buds out and reseat them every 5 mins. I'm using a after product foam type ear piece - you can squish it down tight, put it in your ear, and it will expand to fit perfectly. Battery life has been great for the time I've had these (about 6 months). I'll work around our 7 acre property for 6-7 hours without having to charge and it still has juice left if I forget to charge them. This also has an option to be used as a corded ear bud as well, which I did find useful since I travel a lot and use headphones with a plug while flying to watch movies or listen to music. Now I have the best of both worlds. From a cost/value perspective you can't beat the price and they do seem to be of good quality. I would recommend this to anyone looking for a versatile set of music buds, that stay put in your ear and block out unwanted noise, keep their charge for 7+ hours, and are easy to pair to your phone/tablet or computer. I'd definitely buy them again.

These have been great so far for the price. I’ve had a few similar models but I LOVE the wire on these that loops around my ear, it’s a lot more rigid than others and keeps the battery end in place so it’s not flopping around behind my ear. The sound volume/quality and connection have been perfect for me. There are some downsides like the super loud ‘CONNECTED’ alert when you first put them in, but overall I’m very satisfied with them.

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.

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.

I want to give these a 4 star but i can't with how bulky the case is not portable in the slightest. Biggest drawback of these is that every so often there is some crackling that travels from left to right. The voice for the connection is too loud even at love volume along with the action noise when skipping songs. other than that it gets the job done of wireless good sounding earbuds. If it just had better case and quieter action noises these would be a perfect upgrade to using the KZ buds more often and wire free.

Okay so I'm returning this. Not only is it randomly disconnecting now, the "coonickteed" (Connected) and "deezcunecteed" (Disconnected) notifications in ear are EXTREMELY loud and infuriating. I really wanted to make these work because I like the format, but I just can't take it anymore. I'll get a Bluetooth headphone adapter or something. Anything is better than this cheap overpriced piece of Chinese crap. I've added a video with audio (it doesn't accuratly depict how loud it is when they're in your ear) so you can understand what I'm talking about. It was funny at first when it was only happening in the case before I put them on my ears, however when they are on and you are listening to high Fidelity music or something, and they randomly disconnect and you get an ear piercing notification that they have been "disconnected" shortly followed by a "connected", it gets old FAST. Anyways, they're going back. OLD: Functionally they work very well. The audio quality is fantastic for Bluetooth and they are very comfortable. The only complaint I have is the voice that says when it's connected, in pairing mode, etc. It's like they looked for the worst, most unclear, terribly challenged foreign accent they could find, and then compressed the audio to a point it sounds like it was recorded over a phone line in 1876. It just makes it feel like I should have bought it at the dollar store.

I just ordered a second one. Sound quality for Bluetooth is INCREDIBLE!!! I’ve been using with the castor pro bass edition. At 1st I was iffy, but there was a slight learning curve for me. A hidden feature boost volume and performance by pressing the left button 3x. If you own an iPhone as I do, don’t mess with buying the pro version of the az09, because the difference isn’t worth the extra $20.00. The regular version is AMAZING!!! I’ve been using it nonstop with no issues AT All. I own the AirPod pro gen 2 and listening to music with this is 3x better than those. The battery life is good for me. I think the longest I’ve used them straight is about 4hr with no problem. Had them for about 3 weeks at this point and only charged the case twice so far. They seem to have a nice build quality, no issues in that area either. For the price $ in my honest opinion I don’t think you’ll find any better bt adapters for iem’s like this. I bought my first pair for $30.00 then noticed them on sale for $24.00 and said yep, I’ll order a back up pair just in case. All boxes check for me though sound quality awesome, noise floor almost non existent. Good battery life. Nice range, about 30 feet. Good build quality 👍🏻 and the mic works good on phone calls as well.

I’ve been using the KZ AZ09 adapters with my Melody IEMs for about five months now, and they’ve quickly become my go-to setup for work and daily use. The bass hits hard, the clarity is excellent, and they get plenty loud without distortion. No compromises in sound quality compared to wired use—they drive my IEMs effortlessly. Pairing is instant, and I’ve had zero connection drops. I’ll leave my phone in my truck and walk around a job site or warehouse, still connected clearly over 100 yards away. Battery life is phenomenal—I get multiple full workdays without needing a recharge. The charging case is simple and solid. It announces when you’re connected, and it’s never let me down. The touch controls are responsive and cover all the basics: play, pause, skip, volume. I’ve made calls with them too, and the mic quality is surprisingly crisp—no one’s ever complained. They’re also ridiculously comfortable and secure. I forget I’m wearing them most days, even after hours of moving around. The build quality is legit—they’re sturdy, not flimsy, and they’ve survived multiple drops without a hiccup. At this price, the AZ09s are a no-brainer. If you’ve got a favorite pair of IEMs and want to go wireless without losing sound quality or reliability, these are absolutely worth their weight in gold. ⸻ ✅ Pros: • Fantastic bass and clarity • Incredible Bluetooth range (100+ yards) • Long battery life (multi-day use) • Reliable, quick pairing • Comfortable and secure all-day wear • Durable build—survives drops ❌ Cons: • None that I’ve encountered