Dolby sound effects ｜Super long standby. Electric quantity ｜ Digital display. Directional transmission. Accurately convey to the ear. Bluetooth version: 5.4. Earphone battery capacity: 50mAh. Battery capacity: 300mAh. Transmission distance: ≥10 meters (in an open environment without obstacles. Talk time: about 3h  | Play time: about 5h (medium volume)