1. BT version: v5.3. Chip: JL AC6983D2.2. Supported protocols: Headset, Hands-free, A2DP, AVRCP.3. Transmission distance: 10m.4. Transmission frequency: 2.4Hz.5. Speaker unit: 6mm.6. Impedance: 32Ω ± 15%.7. Frequency response: 20-20000Hz.8. Sensitivity: 95dB ± 3dB.9. Battery capacity: charging case 300mAh, 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). Standby time: 150 hours.13. LED digital display of power level. Transparent charging case cover.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: 60 × 49.5 × 27mm.18. Total weight: 43g. Single earbud weight: 4g.