Bluetooth earphones, version 5.2; True Stereo earbud system 30mAh 320mAH 3.7V lithium battery for earbuds Headphones Approximately 1.5 hours are needed for charging. Headphones Approximately four hours of work Working time of charging box: two to three times Headphones Waiting period of roughly 280 days Headphones Use the touch multifunction to answer calls, mute music, hang up, and adjust the volume.