KZ AZ09

I've been using the 09s for over a month now as my daily drivers, and I broadly like them.

The build quality is great: the old necklace style KZ bluetooths were, essentially, just a power cord with a thicker sleeve for the earhooks. Regular rough use absolutely destroyed the earhook's ridigidty and made the hooksleeve peel away. Meanwhile, the AZ09s immediately feel much sturdier, and I know their design is going to fare much better over the coming months.

The battery life is pretty darn solid, too. I've left the buds out of the case several times overnight and still had a respectable amount of juice.

The case itself, while pretty, is extremely thick, and may be hard to comfortably put in a pucket. I'm a girl, but luckily I generally wear stuff with good pockets. Skinny jeans are right out, though. These boys are chonky. Not to mention the sleek black makes the case incredibly hard to find, compared to the white earbuds I've had before, or the grey of the old necklace model.

That's not the only thing I find clunky about these guys: their volume situation is borked. Like the necklace models, these guys put out a prodigious amount of sound, which is absolutely amazing for finding my earbuds across the house. Pick a rock song, crank 'er up, and follow the noise.

Unfortunately, the volume slider on my phone was not equipped for this level of range. My options are going a click up to make everything slightly too loud, or a click down so it's slightly too quiet. Maybe that won't be a problem when I'm an old lady and my hearing deterioriates.

What won't change on the AZeds is their volume. There are no volume controls on this thing. There's a function for AI assistant and a super low latency mode, sure. But no way to change volume except by directly manipulating my phone. Combined with the aforementioned volume scale issue, I feel much more tethered to my phone now. Can't just keep my phone in a random pocket, stick these in and go for a run/drive. No, I have to know exactly where the phone is in case I want to change my decision of slightly too loud or slightly too quiet.

Maybe I'm being a bit harsh. I really do love this thing, even if it's a direct downgrade to the old necklace model if you're looking for intuitive controls. I'm not someone with a lot of cash to spend on fancy hi-fi, so I've found KZ to be fantastic value for the money, with lots of stylish, consumer friendly stuff. The replaceable earbuds aren't made significantly less durable, but they extend the life of the device by a ton. If you can look past its flaws, there's a cheap, durable, stylish daily driver here. I certainly plan to use mine for a long time to come.

Slightly rolled of highs compared to being wired but some might like this as it tames the KZ 'V' signature somewhat. Battery life is great, I routinely get 5+ hours and with the case, I can go a Week between charges. You don't know you are wearing them, they are so light. Connection wise, they never miss a beat until I'm in a busy city area that has a lot of 'point to point' Wi-Fi links present. They can get a little muddled when it comes to this but bear in mind that these are massively powerful, industrial grade radio signals that they're being blasted with, at the same frequency! I can forgive them for this odd blip. It only really happens in major train stations in London for me. The AZ09 come highly recommended from me. As an audio engineer of 30 Years, they definitely pass my acceptablility threshold :)

At first, they were exactly what I was looking for, I was able to take my IEMs and make them wireless. After a few weeks the right ear was really spotty, turning my head would make it cut out, and now the right ear doesn’t hold a charge very frustrated I’m just glad they weren’t more expensive.

KZ AZ09

Connection stability while using both buds could be better, frequently stutters stops playing in one of the buds.
The voice notification (when powering on\off, switching modes) is also not great, much prefer simple beeping sounds instead.
And I was also expecting better battery capacity from the case, given the size of it.

Beside those, they fits my need with decent audio quality as a cherry on top.

Thanks guys everyone now thinks I'm wearing hearing aids. Battery life is amazing I use them literally all the time and they haven't died once and I usually charge the case every 3 days
really amazing connectivity aswell

I use these daily with my KZ ZSX and have to say that this set simply blows any other TWS set in the same price range out of the water.
The best thing about their ergonomics is that thanks to the ear hook there's no need for me to constantly adjust the IEMs within my ears every 5 minutes, even when running.
I would have loved for them to also have some kind of volume control, but having physical buttons instead of the so popular touch sensitive nonsense is already a big plus (and I can always set the music volume from my pocket through my smartphone's physical buttons, so..).
All things considered, if you have and love your pair of KZ ZSX or ZSN (I have those too) this is the best accessory to carry and use them on a daily basis.
Granted, the sound quality suffers a little, but it's a Bluetooth module, what else is there to expect

Very nice upgrade to my CCA 16 drives and the where shipped very fast, thanks Linsoul. 🙏🏻

I received the package 1 side doesn't charge and the seller asked to ship it back for testing but shipping is more expensive than actually the product cause and I bought it I have bought other products

I had high hopes for these considering they claim to use Bluetooth 2.1 and have relatively good battery life but for me that's where the positives end and the problems begin.
Packaging and product quality: The charging case and device itself seem well built and solid on the surface. They fit nicely on my ears without pinching and hold even with a lot of motion. If you're looking for something that fits easily into your pocket you may want to look elsewhere but given that these are adapters for larger in ear monitors and not just wireless ear buds then it's a nice case that will fit well into any bag / backpack.
Battery Life: These will charge several times from the case before you need to break out the USB cable and they last a respectable 6hr+ though I haven't needed them longer than that in a single session so far.
Interface: There is a single button on each ear. If I turn one on, connect it, THEN turn on the other it will usually connect and sync to the other just fine. If I only want to use one at a time that works well too. It's very clear that the woman who voiced the audio prompts did not know English though it was mostly understandable and all audio comes through at max volume which has to be adjusted using your phone or PC.
Audio Quality: I have been using these with my KZ ZS10 Pro in ear monitors. Wired my KZ ZS10 Pros are clear with punchy bass that isn't as intense as a set of rap / hip hop tuned headphones with clear highs and quieter though still clear mids. When I plug them into the KZ AZ09 BT adapters I notice a couple things. The noise floor is pretty bad during quiet parts of music or podcasts. There's a small electronic hiss that doesn't bother me when something is playing but that does get to me if I'm listening to quieter parts of a classical music piece.
Pitch Shifting / Warping: This part should get its own section. When I first connect these the sound speed / pitch shifts noticeably. When listening to a couple very familiar songs you can hear the happy up beat guitar warp to almost a minor note and then pop for a second and come back just fine. This happens several times and is more frequent just after you've connected. I handed them to my boyfriend and he noticed it on the sample songs I showed off that he'd never even listened to before.
Range / Connection: The range is not great. Now I have never tested any other true wireless Bluetooth ear buds but it is shorter than the range on any other Bluetooth device I own but even so it seems perfectly acceptable. I can listen to my PC in the living room while one room away in the Kitchen which is fine with me. The real problem is the stuttering and cut outs. It doesn't matter where I stand in relation to the source these will occasionally just decided they don't like being connected and pop in / out frequently. Sometimes it's perfectly fine and I have no issue but other days it just refuses to remain steady.
Conclusion: If you're not doing any accurate listening through these and just want easy wireless connection to your phone then it's fine I guess for the price. That said one day when the sound was warping and it kept cutting in and out I just got frustrated and plugged my IEMs back into the regular aux jack cable and never looked back. I would shop around for something else if possible or grab something like a Fiio BTR3K instead. You'll pay more but it will be SO much more reliable.