【Longer service time and high-quality playback】 with the updated USB battery, the sleep headphones can provide 10 hours playing time with only 2 to 2.5 hours charging time. The quality chipset ensures clear sound and lossless music, even when the headphones are in sports. Built-in microphone and volume buttons that allow users to answer hands-free calls and edit the previous / next track without having to use your phone.