Bluetooth chipset: JL Bluetooth version: V5.0 Frequency response. 20Hz-20KHz Battery capacity of the earphones: 50mAh * 2 Battery capacity of the charging case. 600mAh Working hours: 7 hours Working distance: ≥ 10M Headphone charging time: 1 hour Charging box charging time: 2 hours Earpiece charging time: 5 times Colors: Black, White