* Bluetooth version：CSR 4.1

* Loudspeaker size：10mm+8mm

* Speaker Impedance: 16Ω

* SPL(sound pressure level):99bd±3db

* Max  Power: 2mW

* Frequency response: 20-20KHz

* Battery capacity: 80MAH

* Microphone sensitivity: -38dB

* Continuous Operating Time:4H

* Operation distance:>10M