1. Drive: 40mm 
2. Impedance: 32 OHM 
3. Bluetooth version: V5.0 
4. Bluetooth frequency band: 2.4GHz 
5. Power level: CLASS II 
6. Bluetooth distance: barrier-free 10 meters 
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. Music time is about 10-12 hours 
12. Standby time is about 120 hours 
13. Battery capacity 250MAH 
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