CCA KZ AZ09 IEM Bluetooth Adapter,Bluetooth 5.4 Ear-Hook Module

I'll give you a quick TLDR: They are good, buy them. They have latency on HD audio which sucks for watching video, but if you turn of HD audio they still sound great and the latency goes away. The rest of this is specifics about the the audio. Honestly, these sound amazing and I don't really feel the lack of lossless audio. The AAC audio is very high definition and it doesn't really sound different than one of my bluetooth DACs with lossless paired with the same iems. It seems that the digital amplification circuitry is very good a similar to a proper dac. No "hiss" at low audio levels and no crunchy fade in's from silence to audio. Reading some of the other reviews people have mentioned that the pairing audio is super loud. I would agree with that, but in my case I never ran into disconnections so I never deal with it. I think if you also experience solid connectivity that shouldn't be a problem, but your success will vary. I will say that I am really please with how stable the connection is as a huge guy. This is going to sound dumb, but I'm used to headphones cutting out if they don't have really good bluetooth because bluetooth signal has a hard time transmitting through flesh. Being 6'5 and 350lbs, I'd say 1 out of 4 bluetooth headphones I use cut out randomly at times because of this issue. These didn't have that issue with either headphone. One tip I will give people with these is that, if you are dealing with serious latency while using them to watch things like youtube, it seems like these headphones are slow on the decoding of the HD Audio. They sound genuinely fine even without HD audio on, so if you are using them with Youtube a lot you might turn off HD audio. Oh, and the case is 10/10. Seriously, I have a case for my IEM's and it's fairly compact, but given the nature of the IEM's I use the most, they are just chonky. It's hard to make anything that isn't thick that can safely store them. This has just enough room and the rounded edges makes it about comfortable as a case for these IEM's can be. It makes me want to 3d print a similar case, but with a little extra room for a cable.

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.

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’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

I should start out this review by mentioning that I bought this product knowing the risks to it-- my justification is that if the adapter fails, it's significantly less money to replace that than whatever luxury bluetooth headphone would also only last a bit longer than whatever this does, at a fraction of the cost. I've had these since very late January and use them at least 3 times a week for over 8 hours per day. The sound quality to me is almost identical to the wired, however I may just be blind to any differences in that regard, because of how much this outshines every other pair of (bluetooth) headphone I've ever owned lol. The convenience, sound quality and battery life make this worth it for me, but here are some things I figured I'd write down for anyone interested in why it's only 3 stars if I recommend it: The case itself is Massive and feels pretty cheap. I carry a lot of things in my pocket, and it's by far the most bulky. The connectivity is a little.. weird sometimes? Occasionally, when I'm putting the case in my pocket, I'll hear "connected" come through the buds, despite already being connected lol. I've had some prior (unrelated) buds do the same, however a new thing is that sometimes when in the case, they will still be connected and play audio through the buds instead of disconnecting. I've learned to turn off my bluetooth in hopes it shuts the earbuds off. One singular time the audio quality was really bad? It was for about three seconds and went back to normal. And another, more concerning time, was when I was putting one earbud back in the case and out of nowhere the one I wasn't using started making clicking noises through the speakers. I had to unplug them from the adapter in hopes it wouldn't ruin the buds, and has yet to happen again. No clue why it happened. Sometimes it does look like the adapters aren't connecting to the case to charge. They do eventually register for me, but like I mentioned above.. it may be that this isn't always going to be the case (lol). You can definitely hear them rattling around in there sometimes. There is also a latency issue, but I really never notice it much unless I have an alarm go off. I don't believe these have a mic, but I do also wish to mention that the few times I've called while wearing them.. it seems like it may be trying to use the headphones themselves like one? (Y'know how back in the day you could do that with wired pairs when you put them in a microphone port and they sound horrible? It seems kinda like that's happening from people's descriptions) I'll update my review if these ever do kick the bucket. I do plan on getting a replacement if that happens though. Until then, assume these are still kicking!

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.

Works perfectly. It's comfy and has a good grip on my ear, no chance of it falling out. Battery lasts a long time. Charging case is nice too. My only problem with it is the flashing light when pairing is a bit too bright. I was worried about choppy/poor audio, but it turns out it was a problem with my computer's bluetooth usb dongle. It works fine when paired to my phone.

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.

Have turned my IEMs into amazing earphones. They connect well. Make sure that they've been disconnected from every other Bluetooth. A minor niggle is that they have very short range. Otherwise they're fantastic

Bom

Just what I was looking for, Quality seems good, as is the sound,

Overall a good product, but the one thing bugging me is when I have the volume low and on AAC codec which is the highest quality on android it will cut out quieter frequencies. Otherwise, it works well with my KZ ZSN PRO X's with huge range, sound quality that sounds the same as wired except for the issue I mentioned which happens below half volume.