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.

It works, sound quality is awesome. Only 3 stars because of the awful lag. When watching videos, the audio is out of sync with the video.

If I could do 0 stars, I would. I thought they were good at first, but after a few weeks they started acting up. The Bluetooth connection goes in and out sometimes as I am moving, and they keep randomly connecting to my phone when in the case charging. I was literally on the phone in my room and they were in the living room and they randomly connected. I even followed the instructions to manually turn them off, and they still interrupted my phone call by connecting. I'm pretty sure the bluetooth connecting and disconnecting is why my call kept dropping, too. Additionally, they have really loose connections with the earphones themselves, especially the right one. Slight touches can cause them to physically disconnectxfrom the earphones. Low quality all around. Update: 1 month after getting these Bluetooth adapters, the left one is completely dead. It won't turn on or connect, even after charging. The right adapter still works, for now, but the quality is still lower as per my original review.

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.

These are okay for what you pay for. The build quality feels a bit cheap. The case is plastic and the lid doesn't always stay shut properly. Connectivity is good. Sound quality is okay, even in the higher quality mode. Overall, they are extremely average

If youre just looking for something to make your iems wireless these have been perfect for me. No youre not going to get the same audio quality as more expensive ones but its not bad either. On par with most regular earbuds ive tried.

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