Built-in Bluetooth V4.2, which provides an incredible and stereo sound. Great noise canceling function allows you to just focus on your favorite music wherever you are, and clear phone calls are also supported with built-in microphone.Come with mini and portable charging case. 220mAh battery provide extend 3 - 4 hours music and talking time. 45mAh battery for each earbuds. Never worry about low battery when you are in the outside all day.Most popular dual wireless earbuds, fashionable and Black sentience technology Design. No line limited, sharing the music or movie voice with your wife, children, parents or your friends. Wireless connect range up to 10 meters ( 33ft ).