1. All you get for the instructions is a folded piece of cardboard with fine print and confusing diagrams. So, prepare to download the manual in PDF format from the web.2. The cheap, high quality, foot-long charging cable that came with the headphones will NOT charge the device. But I only discovered this after the unit ran for less than 30 minutes before dying of low power. And I used one of my own Micro USB.3 cables. While the device is charging, a tiny RED LED will light up on the right button of the headphones. But you will never know from the instructions that come with the phones.4. Since the cheap quality charging cable that comes with the headphones is loose and broken, you don't even know if you're charging the headphones. Since the instructions that came with it don't say that when charging, a small red light comes on and the light goes out. turns off when the headphones are fully charged.5. Not very loud. The noise from my air conditioner drowns out most of the audio in my headphones.
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