Good product

I have a Fosi Audio K5 Pro Gaming DAC Headphone Amplifier which is excellent and use this for watching TV (via TosLink). But wanted a remote control to adjust from afar so got this. Excellent sound as well once tweeked with the bass / treble. very happy

Buena calidad de audio con respecto a otros modelos que he probado. Lo recomiendo

Quick update to the review, still four stars, but I find one thing very annoying and perhaps the manufacturer will see this and fix it with a firmware update. The issue is once my BLE source is lost such as when the phone leaves the room, the blue "BLE" light continuously flashes. It is annoying. How about just shutting it down after 10 minutes of inactivity? That would be much better.Original review:I did a comparison with standard BT and this unit which claims a special 4.0 BT. The range was definitely better, perhaps 2x the range with solid performance. Using Spotify it's difficult to tell, but the audio did sound better than direct streaming from my iPhone and I will attribute that to a superior DAC in this unit. However, the accompanying materials do not provide specifics on DAC performance/composition.I could not get the TOSlink to work. This could be my amp as I have yet to try it, but the supplied cable was difficult to connect on the device and on the amp. I suspect the cable.The supplied USB cable was actually very nice and sparkly blue - not just the standard black you might expect.My biggest complaint is the bass/treble control on the unit and the supplied remote. If you want to upgrade your audio by using this external DAC, that puts the user in a category that he/she will already have tone control elsewhere and more apt to use an app than physical remote. We are overrun with too many remotes. A quality app that does these functions (on/off, source select, output select, volume) should replace the remote.My last complaint is the system is 5V via USB-C, but no power supply is included and the cable is short (1/2 meter?). I think this is a near-miss to a very nice little DAC

At this point I have tried powering this off of pretty much every arrangement I can think of: the *only* one that will suffice is the included USB-A to USB-C cable connected to a laptop port. Weird, because a plain old USB-C cable connected to a particular wall wart I have should also supply 5V, but okay, I can make this happen with two USB-C to USB-A adapters (one for the power and one for the data).Even with this specific power configuration, seating the power connection required some work and adjustment – maybe I got a connector that's slightly loose? However, after long and patient fiddling I was able to get it working and was rewarded with a noticeably more vivid, lifelike sound, even on my lower-impedance headphones. (My older-generation Mac doesn't have adaptive voltage output, so directly-connected high-impedance headphones suffer in my setup for reasons that have nothing to do with DAC.)If you're thinking about using this DAC in lieu of a direct 3.5mm connection for headphones, be aware that multitasking on a computer is more likely to cause glitching in audio streamed over USB than in audio that uses your computer's built-in DAC. However, in all other scenarios, this will give you a noticeably better sound (more lifelike, better balance) out of mid-to-high-grade headphones. It is also one way to deal with impedance mismatch (though a good headphone amp will do that more cheaply – so if too-quiet headphones are your only problem, look at those first).Overall, I'm pretty stoked; a wide range of music sounds amazing out of this, which far exceeds my expectations when I got it. The audio performance, if not the usability, is outstanding for this price point.