KZ AZ09Pro Bluetooth V5.2 aptX/TWS + Earbuds Hook with Mic Support/40 Hours Playback and APP Control for Standard 0.75/0.78mm 2PIN Connector (C PIN, Black)

I have been looking and waiting for someone to develop a TWS for my good multi driver IEMs and KZ has delivered with the KZ-AZ09 Pro. It is also called the KZ-TWS HD Bluetooth upgrade ear-hook. It uses Bluetooth 5.2 with support for Apt-x formats as well as low latency. The two pin connectors work of course with most KZ IEMs but also with TRN such as my TRN ST5’s. My favorite pairing so far though are with the KZ ZAX 16 driver IEMs (pictured). I stream mainly through Amazon Music HD. These support up to 24 bit/48khz. The ZAX sound as good as any wired solution I have at the moment which is not saying a lot since I do not own anything that can play much higher than that wired.Performance wise, they drive the ZAX with ease and with good dynamics and details. People complain that the ZAX low end is not very good but I seriously beg to differ. With the proper sized tip and good seal the low end is deep, punchy and fast. No bloat in my opinion. The wireless connection has been very stable and has great range. Battery life is really all day with these. I did 8hrs with them straight and still had yet to get the low battery warning. The case charges them with a built in battery to charge them about 4 to 5 times before it needs a recharge. The case has a current usb-c connection for charging but does not support wireless charging. For the price of around $49 you get a great bang for your buck! Highly recommend!

I must say this it's been a journey to even stumble across this kind of wireless setup. I've just started to understand the audiophile world of IEM's and sadly I've spent some money on headphones that were a little disingenuous with their advertising. Luckily, they gave me the opportunity to explore my options and in doing so I've found some phenomenal headphones in comparison to what've been using for entire my life and at a fraction of the price.The only problem I had...They weren't wireless.This bluetooth setup has changed that entirely and my only wish is that more people would know that there is so much more bang you can get for your buck!I had originally bought these for the YINYOO CCZ Warrior but those were a B-Pin Connection. I ended up buying the KZ Zax in Ear Headphones 7BA+1DD Hybrid which was a fantastic and pricer (still nowhere near what I paid for headphones in the past).These have been fantastic and I just want to point out it with it only being a couple weeks of use. I have yet to to have these die or even hear a low battery sound from them but the case has turned yellow on me twice in about three weeks. I've used my macbook charger to charge these in about 20 minutes and I feel like that's normally good for about a week. The mic quality is good but I don't think I can be heard well in noisy environments, not really a downside for me because that is not their main purpose for me but it may be for someone else.My only two cons are that at times (maybe 3-4 times over the past couple weeks) the connection cuts for about a few seconds when passing by what I'm assuming is strong bluetooth connections that interfere with my connection, definitely not a huge problem because this has happened to me before with other bluetooth devices but it is noticeable. The second con is more of wish haha, the case is a bit bulky and I've definitely struggled to find the opening side.Outside of that, I highly recommend these for anyone exploring their options in affordability and superior sound.

The noise floor is hardly noticeable and I haven't experienced any connection issues in the past month compared to the original AZ09. It uses regular aptX not aptX adaptive but the sound quality is still solid. It's not listed in the manual but triple-clicking the left button enables a hidden high-gain mode that simply makes it louder. They also have a quirk where sometimes they will stay on and connected to my phone inside the case but just making sure they are seated properly on the charging pins has prevented that from happening again. Battery life is amazing compared to regular TWS earbuds. I use these continuously for 5-6 hours and my phone still shows 50% battery remaining. Unsure if that is correct but that's already more than the 4 hours I get with OnePlus Buds Pros with ANC on. I paired these with my Moondrop Arias but they will need modification since these are C-pin and the B-pin version is nowhere to be seen. The black part is silicone and the inner part is plastic so it is very easy to trim with a knife and file.

Good product but broke within 3 months. The unit for the right ear stopped outputting sound, though the buttons still worked. I checked the actual earbud itself with a working unit and it was fine. So something within the broken Bluetooth unit is preventing it from relaying the sound.Sellers contact information is unavailable or hidden somewhere. So I was unable to speak with them about getting a refund or fixing the issue.

Solid. Really appreciate that I now have the choice to go wired or wireless and have pretty good sound quality either way. And for a reasonable price. I also like the ear hook because other true wireless buds tend to slowly slip out and fall. Microphone quality isn't great, but not terrible. I tried using the high performance mode along with a wireless headset dongle on my PS5 and I could barely notice any latency if I really looked for it. Nice little surprise. Only been a few months, so unsure how they'll do in the long run, but I'm very very happy so far. 👍

Had these to pair with my 7 driver ZN’s. Very comfortable. Sound was amazing. Unfortunately, I was getting a frequent signal cutting issue. Very annoying for this audiofile.