KZ AZ09 Bluetooth 5.2 Module Wireless Waterproof Ear Hook Extra Long Battery Life Bluetooth Cable for ​KZ ZST/ZSTX/ZS10/AS06/AS10/BA10/ZSR/ES4 (B pin)

I’ve been using the KZ AZ09 adapters with my Melody IEMs for about five months now, and they’ve quickly become my go-to setup for work and daily use. The bass hits hard, the clarity is excellent, and they get plenty loud without distortion. No compromises in sound quality compared to wired use—they drive my IEMs effortlessly. Pairing is instant, and I’ve had zero connection drops. I’ll leave my phone in my truck and walk around a job site or warehouse, still connected clearly over 100 yards away. Battery life is phenomenal—I get multiple full workdays without needing a recharge. The charging case is simple and solid. It announces when you’re connected, and it’s never let me down. The touch controls are responsive and cover all the basics: play, pause, skip, volume. I’ve made calls with them too, and the mic quality is surprisingly crisp—no one’s ever complained. They’re also ridiculously comfortable and secure. I forget I’m wearing them most days, even after hours of moving around. The build quality is legit—they’re sturdy, not flimsy, and they’ve survived multiple drops without a hiccup. At this price, the AZ09s are a no-brainer. If you’ve got a favorite pair of IEMs and want to go wireless without losing sound quality or reliability, these are absolutely worth their weight in gold. ⸻ ✅ Pros: • Fantastic bass and clarity • Incredible Bluetooth range (100+ yards) • Long battery life (multi-day use) • Reliable, quick pairing • Comfortable and secure all-day wear • Durable build—survives drops ❌ Cons: • None that I’ve encountered

Works perfectly. It's comfy and has a good grip on my ear, no chance of it falling out. Battery lasts a long time. Charging case is nice too. My only problem with it is the flashing light when pairing is a bit too bright. I was worried about choppy/poor audio, but it turns out it was a problem with my computer's bluetooth usb dongle. It works fine when paired to my phone.

I was looking for another cheep pair of wired earbuds when I seen these Bluetooth earbuds. They cost more then I wanted to spend, but the vast majority of reviews really seemed good, so I decided to break down and spend the extra money on my first ever pair of wireless earbuds. WOW! These things are absolutely awesome! The base they put out is unbelievable, and the volume is on another lever for earbuds, so loud! They are loud, deep, and clear sounding with no distortion. It's like having hi-fi stereo system on your head while walking, riding a bicycle, or whatever you do on the go. I highly recommend these! Well worth the price.

So far so good,idk if it has to do with the sound,but it’s kinda thin no bass enough.

So far they have worked well. I made sure to fully charge them before using them today and they have lasted around 5hrs so far. The sound quality is better than I expected, they are just a little under powered for my IEMs, so the max volume level is slightly low. I expected that compared to my wired DAC. I have not had any issues with them coming lose and my IEMs stay in place just like they do with other wires. For the price, you can’t beat them.