I was seeking for this specific format because I don't really like the TWS format (I don't like bringing cases with me; it's just my trouble). I used Bluetooth for a very long time since you could plug anything into it. Senheisers 400s were present, and the sound was perfect (fortunately, not an audiophile). Concerned that the sound quality might decline. Yet, the sound didn't turn out to be any worse and, in fact, it was probably much better because the bass sounded deeper and didn't seem to amplify the high-pitched teeth (and such headphones came across). The more I used them, the more I realized how well thought out they were. The LED is not bright, turning on and off can be understood by a unique sound, and there is only really one control button, but it's surprisingly quite convenient because you can always find it. However, it's still impossible to understand a quality like reliability about them because of how lately they appeared. In a year, it will become obvious. overall good headphones
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