1. Unit: 40 mm 2. Impedance: 32 OHM 3. Bluetooth version: V5.0 4. Bluetooth frequency band: 2.4 GHz 5. Power level: CLASS II 6. Bluetooth distance: 10 meters without barriers 7. Frequency response: 20-20000Hz 8. With A2DP/AVRCP high quality stereo audio transmission and remote control protocol 9. Charging time is approximately 2 hours. 10. Talk time is approximately 10 to 12 hours. 11. The music time is approximately 10 to 12 hours. 12. The waiting time is approximately 120 hours. 13. Battery capacity 250 MAH 14. Charging power supply: DC5V power supply [round hole interface] (computer USB port, mobile phone charger, car charger) 15. Compatible mobile phone: Compatible with Android, Apple, Microsoft, Saipan system 99% of mobile phones with Bluetooth function
