1. BT version: v5.4. Chip: AC6983D2. 2. Supported protocols: Headset, Hands-free, A2DP, AVRCP. 3. Transmission distance: 10m. 4. Transmission frequency: 2402-2480MHz. 5. Speaker unit: 13mm. 6. Impedance: 32β¦ Β± 15%. 7. Frequency response: 20-20000Hz. 8. Sensitivity: 98dB Β± 3dB. 9. Battery capacity: charging case 320mAh, headset 40mAh. 10. Charging case input: DC5V, Type-C. 11. Charging time: about 1.5 hours for charging case, about 1 hour for headset. 12. Talk / music time: 7 hours (80% volume). Total working time: 28 hours. 13. LED indicator. 14. Battery display: supports for iP phones and some Android phones. 15. Supports leader-follower switching, voice assistant activation, songs switching, songs play / pause. 16. Headset automatically turns on when taken out from the charging case, automatic pairing. Headset automatically turns off when placed into the charging case. 17. Sizes: 61 Γ 48 Γ 27mm. 18. Total weight: 46.5g. Single earbud weight: 4.3g.