Bought for my wife for Christmas and she never used. We have all the different size ear pieces except one (I blame the toddlers). You can charge the case which then charges the headphones when you put them in it. It has usb and micro usb connections (the cord wraps around the case in a clever way). They easily synced with my iPhone. Sounded just as good as my wired Apple headphones. Other features as by Best Buy website (150$ there now). Jam as you work out with these JLab Audio Epic Air wireless earbuds. Their 8mm drivers produce high-quality sound, and the built-in microphone lets you take calls hands-free and access Google Assistant or Siri. These IP55-rated JLab Audio Epic Air wireless earbuds have a six-hour battery life, and their included charging case adds 32 hours of playback.