1. Unit: 40mm 2. Impedance: 32 OHM 3. Bluetooth version: V5.0 4. Bluetooth frequency band: 2.4GHz 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 about 2 hours. 10. Talk time is about 10-12 hours. 11. The music time is approximately 10 to 12 hours. 12. The standby 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
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