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)

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.

I'm using this with KZ ZSN Pro Dual Drivers 1BA 1DD in Ear Earphones. They paired easily and quickly with my phone so yipee. I do wish they had a dedicated app for permanent equalizer adjustments similar to fiio (but my fiios broke after 3 days so they're out). the "turn on" "turn off" "disconnected" "connected" "performance mode" voice over lhas a hilariously bad stereotypical asian accent, and it is crazy loud. i try to keep my headphones off my head until after i've turned them on, or take them off before i turn them off because the voiceover is sooo loud. unfortunatly there isn't any warning before you get blasted with the "low power" voice -over. so that one hurts. They have a sleek 3 fast click performance mode feature that helps the earbuds sound better. i'm not sure if this simply uses more juice to power the drivers tighter or if it changes volume and equalizer settings, but it does have a nice effect on the quality of the buds i'm using with this set. The wrap around cord is comfortable for me, and stays in place very well. i've done gardening and other active things, and haven't felt them slipping off at all, and haven't had any fit induced discomfort. I intended to use them bicycling with a helmet but haven't yet, so cannot comment. I would like a bit more control on the device, and here is where i bring the review back from 5 to only 4 stars. only 1 button per ear, the buttons control on/off (long press) pause/start (1 click) ....3 clicks gives you performance mode. 2 clicks left/right ear gives you advance or rewind to next/previous song. no volume controls, that needs to happen from the source, like your phone. I LOVED this feature on my fiios, with the ear dials, fantastic, but not here. there isn't an app for volume or equalizer control at least not one that i could download. i saw some sites elude to the existence of an app, and i even tried to download one from a link i was hopeful for but it just sat there, and i worry that i just downloaded some malware. (nothing bad noticed yet, but maybe it's just monitoring things for a while....intrusive thoughts i know). with better controls and a MUCH quieter voice over (even with the bad accent) i'd give this 5 stars.

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

This is a frustrating product. Especially when compared to something like the Shure TW2s. The build quality of the adapters themselves seem solid. The case feels pretty cheap, with the lid hinge in particular seeming like it could easily be damaged if dropped while open. The battery life seems on par with other Bluetooth adapters and the sound quality via AAC also seems sufficient, though support for AptX HD or LDAC is an obvious omission. Charging is nearly always a chore. Pogo pins once again prove their unreliability. I have maybe a 15% chance of both adapters shutting down and entering charge mode on the first try. Taking the adapter out of the charge case and cleaning the pins and pads seems only mildly effective. The only solution I've seen for this is to watch the bluetooth connection on whatever device the adapters are paired to and wait for the connection to break, which signals that both adapters are finally charging. The trick I've found to work around this flaw is to simply shake the closed charge case from side to side until the connection drops. The downside to this is that if you're carrying the adapters with you in a bag, they'll often lose their charge connection when jostled and reconnect to your phone when you're not expecting it. If this happens in a call, it's incredibly annoying. Where the true frustration really comes into play is in pretty much every aspect of software and firmware. They have no adjustment for the impedence of the attached IEMs and every sound and voice prompt is LOUD AS HELL. Using Linsoul KZ ZS10 Pros with a healthy 24ohms of impedence, the poorly enunciated English prompts jolt me every time. The "low battery" prompt begins at 30% and it's repeated so often (and so loud) that the adapaters immediately become unusuable until they're recharged. Switching between different devices is a catastrophe. The AZ09s will not switch devices when externally requested, something that every other bluetooth device I've used will do without complaint. They must be in pairing mode before they will even attempt to connect to something else, regardless of whether or not it's been paired before. This wouldn't be a deal breaker except for another of the software's flaws: there is no way to command the adapters to enter pairing mode. This is a baffling omission. The only way to get the adapters to go into pairing mode is to disconnect them from the device side. Forget to disconnect them from your PC before you left the room intending to connect them to your phone instead? You have no choice but to go back to your PC and explicitly disconnect them before they will allow your phone to request a connection. For anyone who switches their Bluetooth adapters between devices multiple times per day, this could easily be a deal-breaker. The adapters flash their too-bright blue LEDs every four seconds when in standard run mode. Why? I have absolutely no idea. They could have made that interval three times as long and it would still serve to signal that the adapters are powered on perfectly well. The voice prompts have the absolute bare minimum attempt at English. I refuse to believe that the designers couldn't fine a single person with a passable accent. It feels, like with many other aspects of the software/firmware, that they simply didn't care. With the newish Qualcomm SOC doing pretty much all the heavy lifting, the lack of any sort of polish software-side is a shameful waste. With no bundled app (which I'm sure would still be a minimum-effort affair anyway), there's no hope for firmware updates to address any these issues. The only aspect that redeems this product is the price. At $30, they're good enough. Unfortunately, they're also the best adapters available for the terrific range of 2-pin Chi-Fi IEMs currently on the market.

for it's price, it's pretty bad, pretty much everyone reports online how the right ear-piece just stops charging about a month after owning them, my issue is constant crackling and broken audio, I've only brought them as back-ups when my other wireless pair wasn't charged, rarely touched them except to test them at home and they are broken, Bluetooth 5.4 is also kinda old for 2026, can't test if it's waterproof because it pretty much is broken before it could get wet and the controls can be confusing as it doesn't really give feedback on what mode you toggled, just *beep* and you have to assume you did something right, also 48000 Hz 16 bit DVD peasant-quality audio is degrading to my ears, it reminds me of my childhood of when I have no money for myself to spend and my parents wouldn't hook me up with awesome hardware, so I never knew what was "good and cool" and just had to work with what I had. as a general rule of thumb for buying audio gear, get a DAC and wired headphones for PC, for phones get the matching brand (I.E Galaxy Buds for Samsung Galaxy, Airpods for iPhone), and if you want wireless for PC, make sure it's made to be a high quality bluetooth headset itself or even better, a USB connected dongle if you want to know why I bought this over-priced, mass-produced product, is because I was shopping for IEMs and thought it would be awesome to have a "hybrid" of being able to conveniently swap between wired and wireless, the IEMS are still good wired, and let's me listen to 24-bit 96000 Hz audio, but this purchase never sat right with me, especially considering how my JBL 710BT mogs these, and JBL isn't even impressive I just bought them long time ago and use them for comfort when I can't sit in a chair for 8 hours, but I'd rather just have my IEMs at this point to be wired only because the type-C pins are slowly chipping and when the protective layer fully cracks and falls off the pins, the pins will start breaking, so heed my warning shopper! or feel the wrath of buyers' remorse!

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.