KZ AZ09 Bluetooth IEM 5.4 Module IEM Bluetooth Adaper Wireless B-pin 0.78MM for ​KZ ZST/ZSTX/ZS10/AS06/AS10/BA10/ZSR/ES4

Absolutely awesome. No problem connecting, the design looks good and fits over the ears very well, sound quality of excellent. I think the "connected" voice is funny but it happens before you can even get them to your ear so you really have to TRY in order to hear it. Make sure you get the right model to fit your specific buds. I don't plan to go back to other headphones any time soon. Highly recommended.

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.

For some ~10 year old Alclair IEMs, these were cheaper than a standard cable. As I'm not touring anymore, I just wanted to put the IEMs back to use as headphones... To make them work, I had to shave down the plug area as the B-Pin style didn't fit in the jack recess on the Alcairs, but after that modification, they work fine and are snug. Sound quality streaming audio from an iPhone is just fine. It's not perfect, but for the price point, I'm completely satisfied. The case was a bit of a bonus for me when I saw the IEMs should fit in it as well, unfortunately these custom molded IEMs don't both fit while still connected to these adapters, so I need to pull one and just left the IEM sitting in the case. Not the end of the world, but not ideal.

I have tested them with with 2 IEMs so far and they aren’t really powerful enough to keep they quality decent. As far as comfort they could be worse I feel the wire is a little too stiff for my liking. They make a solid pair of cheap bluetooth headphones but honestly you are better off saving for the more expensive ones.

Horrible audio quality

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.

The case is the hardest thing to open. I have to stocky fingernail and slide it across the opening line like a two piece cell phone case. Not ideal for a case you constantly open and close. The Bluetooth light does not turn off, it's constantly blinking. If you're in a dark room you will constantly have a flashing blue light. The Chinese accent of connected I didn't think I would be bothered by it, but after struggling to open the case getting frustrated at how hard it is to access the case I get greeted by my iem with "chanekted" Last complaint is that the right and left ear is in the wrong slot in the case. It's switched when you plug your in ears in the correct spot. Bluetooth works, I don't feel like I have too much lag, and distance is average.

Todo llegó en excelente estado, funcional 10/10 recomendado

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

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

Son buenos para convertir en inalámbricos los módulos pero el audio no es tan bueno, así como la conexión ya que se desconecta constantemente y hoy a poco tiempo ya no carga el del lado izquierdo, el que si carga dice que está en 60% aún que lo cargue bien.