KZ AZ09 Bluetooth Cable 5.2 Module IEM Bluetooth Adapter Wireless Ear Hook Portable Long Battery Life for ​KZ ZST/ZSTX/ZS10/AS06/AS10/BA10/ZSR/EDX/ES4/CCA C10 (B PIN)

The quality of the case is very nice, the battery life is amazing I think I used them for a whole week at work before I had to charge them, the sound quality is the best I’ve ever had on Bluetooth. All of this cheaper than any other true wireless earbuds. (monitors used were ks zsts I got for around $12)

I’m never going back to any other bud set

The KZ Earbuds have some of the best sound quality out of any earbuds I've ever used, and I've used mine almost daily since I bought them in 2020 with no issues whatsoever. I'm really happy these BT Adapters are available and I wish more companies would make modular products with parts that can be easily replaced once they wear out or break. But to be perfectly honest, these BT Adapters are pretty terrible and always break completely after about a year of daily use. I've purchased them twice now and both sets wore out in the same ways over similar time spans. Regardless, I would much rather buy them repeatedly instead of having to purchase equally priced wireless earbuds with terrible sound quality that last for the same amount of time. Pros: - They're cheap. - They can be very easily replaced, allowing you to keep using the excellent, more expensive earbuds. - They work great while they last. - Battery life for the adapters is about 6 hours of continuous audio, and the case can charge them ~5 times before needing to be recharged. Probably not as good as other earbuds but I consider it a pro since, again, the earbuds have excellent audio and build quality. Cons: - They're cheap. - Limited lifespan. Both times I've purchased these adapters, I can put them through about 8 months of daily usage before they begin to wear out. - Short range for my usage. I connect the adapters to my PC and wear them when I'm doing stuff around my apartment. Any time a wall or door comes between me and my computer, they lose connection. This might not be a problem if you use them with a smartphone, however. - Once they start to wear out, they wear out fast. Battery life for the adapters dwindles to about an hour while the case can only hold enough power to charge the earbuds a single time. With both sets I've owned, the final nail in the coffin is when the adapter buttons wear out and become stuck pressed down. This traps them in the reset connection function, making them useless. I've tried prying the button back up again to no success, so once this happens they're done for. TLDR, the earbuds these adapters are used with are exceptional in every way, so while they adapters are flimsy and break over a relatively short time span, they can easily be replaced for a similar price point as a new pair of lower-quality BT earbuds.

KZ AZ09 Bluetooth Cable 5.2 Module IEM Bluetooth Adapter Wireless Ear Hook Portable Long Battery Life for ​KZ ZST/ZSTX/ZS10/AS06/AS10/BA10/ZSR/EDX/ES4/CCA C10 (B PIN) This is so well thought out and executed, I have rarely seen a thing be so good at what it was designed to do. These allow your favorite IEMs to be Bluetooth. I know what you are thinking, I bought wiered IEMs for the better sound quality that a cable can provide and that’s true. However there are times when the convenience of Bluetooth is a boon. Trust me I am very, very picky about sound quality and this is one of the best sounding Bluetooth receivers I have ever tried. They come with a charging case and they just work very, very well. Now you can use your 4 or 5 driver IEMs wirelessly. They pair very easily and they just work with any two pin IEMs you may have. There’s even room in the case to keep the IEMs connected to the receivers. They are very comfortable to wear and are super well designed. The sound is fantastic and they are easy and convenient to use. I can’t say enough good things about this product and I am grateful to have it. If you are considering a Bluetooth option for your favorite IEMs you should for sure consider this awesome product.

When you set it up properly it works! Its enough to power my aful performer 5's. However the ability for the device to automatically disconnect when you put the earbuds into the case is dysfunctional after only about a month. Also every time I do turn it off/disconnect it, it forgets my preferences and I have to set it to high performance & high powered modes at every reconnection. It also has the knack to desync with each other and with the phone frequently. These problems became significant just after the return period :(.

Turned my wired IEMs wireless with excellent sound quality. They're a little bulky, but actually really comfortable. The case fits all of my IEMs in it when plugged into the adaptors and the controls work great. No complaints whatsoever, these things are great.

I’m glad this product exists, and it works seamlessly and sounds good But the pins are too short! I have the B version, and you need to tape your iem to the wire.

If you’ve only ever used regular earbuds or headphones before, the AS10 PRO will blow your mind. These are in-ear monitors (IEMs), which means they’re designed to give you clearer, more detailed sound—and wow, do they deliver. Everything sounds cleaner and more “real.” Vocals are super clear, instruments are easy to pick out, and the bass is tight and punchy without being over the top. You start hearing things in your favorite songs you probably never noticed before. They’re also really comfortable to wear for long periods, and the build feels premium—nothing cheap here. The included cable is sturdy and even has swappable tips depending on what device you’re using. Note: These are wired by default. If you want to use them over Bluetooth, you’ll need the KZ AZ09 Bluetooth Cable 5.2 Module (make sure it’s the B-pin version to match the connectors). Honestly, for the price, this feels like you’re getting something way more expensive. If you’re curious about what better audio sounds like, the AS10 PRO is an amazing place to start.

Nice item for the price

Not very great, audio cuts out and switches to other input every now and then,