I have tested it with various IEMs I have, it does what it advertises. I bought it because the device I saw on YouTube was sold out and I have no regrets. Pros and Cons: + Skip, Pause, and Back buttons. + Long battery life, lasted more than 20 hours, charges very quickly. + Sound, louder than headphones plugged directly into my phone. Slight, I mean very slight hissing that is not audible unless you have a very detailed IEM at higher volumes, this may be due to the quality of the audio files over bluetooth. It was very noticeable when new out of the box but it wore off the more I used it. The quality improves when I route it through the optical out to my Mojo+. Very long range, I can hear clearly from my transmission source throughout the house. I say I had a range of about 40 feet. + No lag, I didn't notice any lag. + Very light, when I received it I thought there was no charged battery inside, but it is. - Pocket size, corners could be rounded - Bright blue light and blue screen that glows, wish I could turn it off when listening to it in bed at night - No volume control and I saw.
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