These bone conduction headphones have okay sound quality with good battery life at a reasonable price.
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Pro Good audio quality for bone conducting headphones
The Bluez 2S headphones have clear mids and highs with somewhat lacking lows. The audio quality is comparable to "regular" earbuds in the $70 range.
Pro Good battery life
While the headphones advertise a 6-hour battery life, they can easily surpass that threshold if you don't listen to them at full volume.
Pro Reasonable quality microphone
The person on the other line should easily understand what you are saying. Call quality is clear with little to no distrotion, though voices sound a bit tinny with these headphones.
Con The band could be more comfortable
The band is somewhat rigid making it difficult to wear it comfortably for extended periods of time.
Con Low end is a bit thin
These headphones can't produce the thickness of low end that "regular" headphones can. The low end is till there, it's just not as pronounced.
Con Minor audio leaking
In a completely silent room it's possible to hear the output of the headphones, but that possibility goes away as soon as there's any ambience.