KZ ZST Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless 2pin 0.78MM for ​KZ ZSTX/AS10,Moondrop CHU II/Aria/Blessing

I bought 2 of the kz az09 adapters, one for my castor pro’s and one for my zs10 pro’s. At $30.00 these bt adapters are perfect in my opinion.PROS: very good battery life, I use it regularly and charge the case once a week.Sound is really not much different than using a dac. Pretty low noise on these. The sound quality is AWESOME in my opinion.Good distance, probably about 30ft I’d say.Build quality is pretty solid. No issues as of yet.CONS: the only one I can think of is the case is a bit on the large size, and that’s it. Can’t really take away a star for that very minimal issue. 🤷🏼All in all I highly recommend the the az09 adapters, they do what they are supposed to do, and do it well.

Gotta have your own headphones! These work wonderful, if your on one device they have no issue connecting. I have issues with multiple devices. As I am switching between three throughout the day. But the sound quality is very clear. The different ear tips make it comfortable as you want.

These were a good choice and a great value for the money. I got a nice Fosi IM4 which is open back and removes the sound pressure. Also has better sound the the airpods. Overall this was a nice choice. even though its using aac over bluetooth I get really great sound when paired with lossless from the music services. The earpieces are light but fit securely over the ear and are so comfortable you hardly even notice them. I literally wear them for hours at time. I get good range of at least the 15m advertised with no sound degradation. My only ding here is that they are loud and depending upon the IEM that you use and the buttons are really small. The case is ok it does top off the devices after you take them off but with a 400mh battery it does either one good charge or a couple short ones before the case itself requires charging. You have be cautious the with charging in general, its a dumb circuit, your best bet is to get an old usb type A charger and use it rather than a smart or fast charger. Using the later will ruin the battery in the case and the devices. While they are sweat resistant, i would not consider them water proof.

They Link to bluetooth vary good. The sounds cut in and out constanly. Same result with with 2 different sets. If they can fix that, this would be a quality set.

The sound coming out of it was excellent. The only thing I didn’t like that the functionality was limited but for the price that what you get for . The other big problem. Is that the stuff working with my iPhone even though was working it just stopped working and I had more than one because I really enjoy how it fits around my ears, but all the ones that I have stopped working stop connecting to my iPhone device but to sound quality it was excellent, it was close to wired sound. The earbuds had connected to 16 driver KZ earbuds. I was also able to connect it to my Apple TV, and I absolutely love the sound, especially when I’m watching movies or listening to music.

Being able to take your monitors wireless is great, I go from my pc to my pocket in seconds. Comfortable ear hooks and great latency.

I’m Returning it!I was really excited to use this Bluetooth adapter, but unfortunately it did not work properly with my earphones.I tested it with my KZ ZS10 Pro X and KZ ZS12 Pro X, and the connection was very unstable. The audio kept cutting out and glitching, which made it frustrating to use. On top of that, the microphone did not work at all, so I couldn’t make calls or use voice features.The idea of this product is great, and the design looks good, but the performance did not meet my expectations. Because of the constant connection issues, I cannot recommend it, especially if you use KZ earphones like mine.I hope the manufacturer improves the compatibility and stability in future versions.

Pros: super light, great fit, good sound quality, easy pairing, good valueCons: none so far, will update if any developThese are super light and they hug nice and tight, but that means they're functionally invisible to the user which is good. I bought them for the gym and paired them with a set of ZSTs (cheapest KZs I already had). Cost is just right for latest gen bluetooth imo. They drive the ZSTs perfectly well.

The sound quality is poor, plus I received it with no charging cable.

Amazing sound, especially for the price. Case is larger than current earbuds on the market but really I'm splitting hairs

Muy buen producto, no he tenido ningún problema de conección, ni de carga con los módulos. Recomendable!!!!

Excelente producto

La potencia es muy baja, no se aprovecha la capacidad de el auricular que conectas