Description:Bluetooth version: Bluetooth 5.3Transmission range: 15mMusic time: approximately 7 hours Call time: approximately 4 hoursTotal working time: approximately 25 hours Rechargeable case battery: can charge the earphones 4 times Headphone charging time: approximately 1 hour Charging time for the charging case: approximately 1.5 hours Earphone size: approximately 14.1×9.5×3.5cmSingle