CCA KZ AZ09 PRO Bluetooth 5.2 Module IEM Bluetooth Adapter Waterproof Ear Hook Extra Long Battery Life Cable for ​KZ ZS10 PRO/ZSN Pro X/ZSN PRO/ZEX PRO/AS16 PRO/Zax/DQ6 Polaris/C12/CRA PRO(C pin)

I picked up the CCA KZ AZ09 PRO Bluetooth adapters to make my KZ IEMs wireless, and they’ve been a fantastic upgrade. The sound quality is clear, with strong bass and detailed mids/highs. Connection is stable, and the low latency makes them great for both music and videos. The build feels solid, and the battery life is impressive—easily lasting me through a full day of use. The ear hooks are comfortable and keep everything secure even when moving around. Pairing was quick and simple with my phone, and the Bluetooth 5.2 connection hasn’t dropped once. If you already own KZ/CCA IEMs and want the freedom of wireless without losing sound quality, this is an excellent choice.

So, the charging box is a little jank, feels a bit plasticky and large, and doesn't always register that the earbuds are changing and should be unpaired so I usually just do that manually. Other than that, I absolutely adore this product. As a musician, I've used wired KZ10 in-ears for years for performance. Being able to use a set of KZ10s as standard, walking around earbuds has been such a huge step up from regular Bluetooth earbuds. The sound quality is far and away better than my Klipsch T5 ANC buds that are about twice the overall cost. These also sound much better than any of my other wireless earbud sets from Anker and are also about 2 to 3 times louder. The reasoning is pretty simple: since this is an add-on Bluetooth module that goes around the ears, the actual earbud (the KZ10 IEMs) is only speakers. Normal consumer wireless earbuds have to fit speakers, batteries, buttons/sensors, microphones, and the Bluetooth radio in to the same amount of space. So yeah, since these buds put all the electronics in the over-ear hook, the "bud" is allowed to focus solely on speakers and speaker quality. I found these to be super comfy and well sealed: they're musical performance earbuds, so that makes sense. They stay in the ears well and have excellent battery life/bluetooth connection quality. And the sound quality is impeccable: far better clarify than normal buds, excellent bass, a good amount of separation between lows, highs, and mids. What can I say, they sound much better than normal buds. I had no idea this product existed but I'm so glad I found it: absolute LEAP forward for sound quality with my EDC buds. Try it, you won't regret it.

They sounds pretty dang good and when new the battery lasts an entire work day. The bluetooth range is good and don't have many complaints. This is my 2nd set and the previous set lasted about 2 years before needing replaced after daily use. The connection between the rubber section and the plastic hook will eventually detach and become flimsy and make the device fall off your ears way easier and the rubber part stretches and won't fit in the case nicely to charge. The pin type connection for charging is less than ideal and occasionally I'll go to use the ear buds and 1 of them would be dead in the case and not charging. Eventually the battery life will only last <4 hours before needing charged and the rubber part will deteriorate and the charging will come intermittent. Still better than other cheaper Bluetooth headphones I've used.

I use these on the daily at my desk and for calls. Such a nice alternative to using over the ear headphones. The battery typically lasts around 8-10hrs, but they never really die if you throw them in the charging case when you're not using them for a moment. They fit pretty well for the average person, but if you wear glasses they may get a bit loose over time. My only real gripes are with the microphone and device pairing. The microphone is decent for calls, but since it's facing away from your mouth it can be a little quiet. When switching devices you have to turn off the Bluetooth for what you're disconnecting from and select the AZ09 on what you're switching to. So it's a little annoying. After a few months one of my earhooks stopped working. I contacted the seller and they sent over a new pair. I really appreciate the warranty. Very nice and communicative seller.

Sound quality is soo much better with the cable and the quality is low

These pair well. They were easy to setup. Work well with my phone. Computer hookup went easy. Was spotty at first but moved antenna on desktop problem seems solved. At half volume it would seem these last much longer than 10 hours. I put them on and went to sleep, 8 hours later they were still at half. Hadn't had them long enough to test the charging box to see how well it keeps them charged yet, but like any electronic with a little respect and care shouldn't be an issue there. No one even noticed the microphone change on phone calls. They haven't mentioned it. That's a plus.

Sound quality is adequate. Bluetooth pairing is horrible. I have to reset the BT every 1-2 days. One ear hook will frequently unpair from the source. Water resistant is nice since I use these with workouts. Would not recommend due to daily frustrations with BT.

I ordered these to use with a pair of KZ 24 armature IEM's I ordered so I could use them offstage with my phone. The KZ monitors themselves are great and sound fantastic (especially for the money) with my wireless IEM pack but these just don't seem to have the power to drive them properly. I use an app to adjust the level from my phone to these and it does improve them. There's almost no difference to my ears between the "high performance" mode and the normal setting. Maybe a bit brighter but no appreciable difference in output or quality. Overall I'd say the quality is acceptable at best. The case is large, but that's to be expected given the size of the ear hooks themselves which function well enough. The KZ24's will fit inside but barely. The connectors fit tightly in my with my IEMs and are easy to use without worrying about bending pins which is nice. Battery life seems to be in the range described. Overall I'd say they are ok, but I did expect a bit more for the money. Like I said, the KZ IEM's are great, but connected to these I get better output and clarity from a set of Galaxy Buds.