1. BT version: v5.3. Chip: Blue trum 8926B2. 2. Supported protocols: Headset, Hands-free, A2DP, AVRCP. 3. Transmission distance: 10m. 4. Transmission frequency: 2.4Hz. 5. Speaker unit: 12mm. 6. Impedance: 32β¦ Β± 15%. 7. Frequency response: 20-20000Hz. 8. Sensitivity: 98dB Β± 3dB. 9. Battery capacity: charging case 450mAh, headset 70mAh. 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: 11 hours (80% volume). Standby time: 200 hours. 13. Clip-on design, not in ear. 14. Supports leader-follower switching, voice assistant activation, songs switching, songs play / pause. 15. Headset automatically turns on when taken out from the charging case, automatic pairing. Headset automatically turns off when placed into the charging case. 16. Battery display: supports for Apple phones and some Android phones. 17. Sizes: 74 Γ 45 Γ 40mm. 18. Total weight: 62.8g. Single earbud weight: 6.5g.