• Built-in DSP audio processing system, can be a very good eliminate Noise and echo, to ensure clear communication, and music
• Bluetooth version:V4.0 + EDR. Can talk, listening to music
• Small and light, stealth design
• Battery type:50mA rechargeable lithium battery
• 2 in a row, to the telegraph, voice prompt operation

                                                                               Noted:Just Single Ear