*  Bluetooth version：CSR4.1
* Loudspeaker size：9mm
* Speaker Impedance: 16Ω
* SPL(sound pressure level):98bd±3db
* Max  Power: 2mW
* Frequency response: 20-20KHz
* Battery capacity: 60MAH
* Microphone sensitivity: -38dB
* Continuous Operating Time:4H
* Operation distance:>10M