I picked up the ASUS USB-BT400 Bluetooth adapter way back in 2018, and honestly, it’s still running perfectly in 2026. I’ve built and upgraded a lot of PCs, and this little adapter just keeps working. Connectivity is solid—I haven’t had issues with my headphones, headsets, mice, or controllers dropping out. Everything just pairs up and works, even when I’m swapping devices around for gaming or work. The only exception is my Fire tablet, but that’s not really the adapter’s fault. Some devices have built-in security (like locked bootloaders or pairing restrictions), so they just won’t connect to anything that’s not an approved peripheral. That’s a tablet-side thing, not a problem with the ASUS adapter. Latency has never been an issue for me, even with my high-DPI Razer Basilisk gaming mouse. No noticeable lag, even when I’m gaming or moving between devices. If you’re chasing the absolute lowest latency for competitive gaming, maybe a Bluetooth 5.0 adapter would have an edge, but for my setup, this one is honestly great. I don’t see a strong reason to upgrade when everything just works. It is a great value, it's supported by windows out of the box, it's very small too. The adapter is still going strong after years of daily use, no defects, no weird disconnects, nothing. It’s just a solid, reliable piece of hardware. For anyone needing Bluetooth on a desktop or upgrading an older PC, I definitely recommend it. Still using mine in my current rig and it hasn’t let me down. PC builder, gamer, and tech junkie approved! Read more
Works great with my google pixel buds. I tried a different USB adapter that gave me more range, but terrible audio quality. This adapter on the other hand has a range of maybe 15 feet, but excellent audio quality for my wireless ear buds. And it also works on linux! Read more
The ASUS USB-BT400 Bluetooth Adapter is a versatile and reliable solution to upgrade your PC or laptop with Bluetooth connectivity. Whether you want to connect wireless peripherals, transfer files, or simply enjoy the convenience of Bluetooth, this tiny dongle has you covered. One of the standout features of this Bluetooth adapter is its ease of use. It's a 'plug and play' device, which means that it's incredibly simple to set up on Windows 10/8/7/XP. You just plug it into an available USB port, and your computer recognizes it automatically. This quick and hassle-free installation is a big plus for users who want to avoid complicated setups. The adapter supports a wide range of Bluetooth devices, including printers, phones, headsets, speakers, keyboards, and controllers. This versatility makes it a valuable addition to your PC, enabling you to connect various peripherals and accessories without the need for multiple adapters. Despite its compact size, the ASUS USB-BT400 delivers reliable and stable Bluetooth connections. Whether you're streaming audio to wireless speakers or enjoying lag-free gaming with a Bluetooth controller, this dongle ensures a seamless experience. ASUS is known for its quality and durability, and this adapter is no exception. It's built to last, and you can trust it to provide long-term Bluetooth connectivity without issues. The sleek black design of the dongle blends well with most computer setups, and its small size means it won't block adjacent USB ports or get in the way. In conclusion, the ASUS USB-BT400 Bluetooth Adapter is a cost-effective and efficient solution for adding Bluetooth connectivity to your PC or laptop. Its 'plug and play' setup, compatibility with various devices, and reliable performance make it an excellent choice for users who want to enjoy the benefits of Bluetooth without the fuss." Read more
So like everything... it's not perfect. But given the price point, I'm not complaining. Just to be clear so people have complained about streaming audio from this unit, and that is not something I have done, so if you are looking for an opinion on that you can stop reading now. My prior BT adapter (non-ASUS) always had problems keeping the connection to my BT Keyboard. And I would have to unplug it and plug it back in. This was a horrible inconvenience. This unit does not have that problem at all, which is the biggest reason I like it, but some of the other features have been great as well. While I haven't streamed audio from the unit, I do use it to stream audio to it. And this works fantastic. I really like the ability to use my phone to stream audio. Been great for listening to web radio. However, it is a little annoying when a phone call comes in, because it will want you to use the unit as a speakerphone, which is an issue since I don't have a mic on this PC. The proximity locking feature is also nice. Set it to automatically lock your PC when your phone is out of the specified range (3 settings, Close, Very close, and Intimate) It's nice, but a little too sensitive. I found that if I use my phone to do other tasks it will lock my PC. So I am not using this feature anymore. It also says it will allow you to send and receive text messages via the ASUS software. I don't know if this works for anyone, but I have an iPhone 5, and it does not work at all. Not a big deal though, but it is annoying when you have something that doesn't work like it says it would. But this is likely an Apple issue, and not an ASUS issue. Overall I am very pleased with this unit and would highly recommend it. I would give it 5 stars, if it didn't try to hijack my phone calls when I am streaming audio to it. The hardware is great, the software needs a little tweaking. Read more
