Sennheiser Consumer Audio BTD 600 Bluetooth® Dongle - USB-A/USB-C Adapter with AptX Audio Codecs for Stable, Sound - Listen to Music, Make Calls, and Watch Videos

I can't believe the difference in sound quality! It works perfectly. Be sure to read the quick start guide because it's a little tricky to setup. Apple users...you need to know that you will no longer be using the internal Bluetooth, you will now be using the adapter. You actually pair your headphones to the adapter. Also, be certain to download the Momentum 4 app on your iPhone. There, you can see if you are now using aptX, which is necessary to transmit the music in High Resolution. If the CODEC doesn't say aptX, you are not getting the highest quality sound. Keep trying.

Update: Since I posted this review, the BTD-600 had a firmware update that has completely overhauled the device and improved the audio quality in major ways.For starters, the most recent firmware update claims to add support for the sample rate, 96khz. I say claims to because that's not what my Qudelix-5K Bluetooth DAC is reporting, and even before this update, Windows let you select 96khz. I suspect even if it did support 96khz, the Qudelix would not be able to receive it at that rate. It uses the QCC5124 chip, and if you look up the features, the chip doesn't seem to support 96khz. The first mention of 96khz audio came with Bluetooth 5.2. With the BTD-600 being a Bluetooth 5.2 adapter, it would make sense for it to support 96khz, but I don't have a device capable of testing it. For the record, it seems that chips that support AptX Lossless use Bluetooth 5.3, so I doubt this adapter will ever receive an update adding AptX Lossless.While I can't say whether it's actually transmitting 96khz, I can say that the 280kbps limit has been lifted. On my Qudelix-5K, I'm able to receive audio generally from 350kbps up to a maximum 430kbps, and the difference in audio quality is significant. Before, the audio quality was noticeably compressed. Not terrible, and the benefits to latency make up for those shortcomings, but also not great. Now, to my ears, it's functionally perfect, and the best part about it is that it does this without affecting latency. It still seems to deliver 80ms of latency, just with significantly better audio quality. This is very different from adapters that have separate low latency and quality modes, like the Creative BT-W5, which seems to at least double the amount of latency when in quality mode, and limits the audio quality in low latency mode, similarly to how this adapter used to work, and that adapter is 25% more expensive than this one, and in terms of its implementation of AptX Adaptive, it's just worse.For this reason, this is an exceptional adapter for movies and games, which, in my opinion, is the big draw of AptX Adaptive. If you just want high quality for music, AptX and AptX HD are open source now. On Windows, you can buy Alternative A2DP for $5 and get high audio quality, without needing separate hardware, and I'd expect more devices to start supporting AptX and AptX HD by default from now on, but high audio quality and low latency is something you can only get from AptX Adaptive, and even other, more expensive products aren't able to deliver what this adapter does.That being said, it's not completely perfect. I noticed some stutter. It's pretty bad when you first connect your device. Over time it becomes more stable, but brief instance of stutter still happens occasionally. Signal strength is far more important now than before, probably because it's not hard to keep a 280kbps audio stream stable, so you're going to want to keep a clear path between your headphones and the adapter, and try to keep distance as low as possible. Maybe this is improved with a Bluetooth 5.2 receiver/headphones, but I can't speak for that.

It definitely helps the connection issues the Momentum 4 had via bluetooth on PC. I do feel like it's a bit too expensive for what it is, though. Especially after dishing out the price tag for the Momentum 4's.

Upgrading from Win 10 to Win 11 on my Lenovo Yoga caused my TW2 earbuds to lose a stable connection making them mostly non-functional as the internal BT radio set did not include the aptx codec. Microsoft has a solution but it is a PITA to do. Called Sennheiser. Michael and William in Tech Support recommended this dongle as the fix. They were spot on. Installed as per the instructions and my TW2s paired up. Now using the dongle as dedicated to my TW2s and the on board BT for my mouse and keyboard. Very pleased with the unit and especially with Sennheiser's service.

Audio quality is great, but the latency wasn’t cutting it for me, I was getting like 2-300ms.Shifted over to the Avantree DG60P and that did the trick. No more latency issues!I don’t want to take away from the fact that this product does exactly what it claims to do though. Overall, good product. Just didn’t fit my usage case.

I'm 2 feet away from the dongle and it will nit stay connected, and I've tried everything. I assumed it was another usb connection Interfeering. So I unplugged everything except for the dongle and it does not stay connected. I also have a ugreen adapter and that thing stays connected across the room. I thought having the official dongle would be useful, but it's anything but

This dongle is absolutely fantastic......when it works. If you have a Sennheiser headset, this will work with them. At first, the connectivity is really good but then there will be times where it will disconnect. To fix that, you would have to either turn off, then turn on the headset, OR unplug the dongle and plug it back in. I used this to have my headset wireless while being able to use my GoXLR while gaming, or streaming. It became an annoyance when it would disconnect during my gaming sessions or just simply listening to music. Even though I do think the price is a little on the high end for this issue, it does work really well, when it actually works if that makes sense. Even when there are other reviews saying the same thing I always get a product to try it for myself and I had it for a month and a half to give it a shot for the Christmas time since there is a longer return policy. Numerous times it has disconnected and I had to return it. The lag is very minimal, and the sound quality is still good. The dongle is a small size so you would be just fine that it won't take up much room in the back of your PC or wherever you plan on using it. Use at your own risk, however in my opinion with the connectivity issues that myself and others are saying, I don't think it's worth it. I ended up going wired connection instead.