... portable mini bluetooth speaker 1,high quality sound 2,hands free 3,echo and noise reduction Model No.: BSK02portable mini ... Level:80dB at 0.5m,* Built-in Anti-noise Microphone,Interface:* 4 Button design: MFB, VOL+, VOL ... -, Slide switch,* LED Status Indicator: Blue, Red,* Mini 5 Pin USB charging Port* Color: greenPOWER:* Rechargeable ... Temperature:-20 °C~80°CPhoto: portable mini bluetooth speaker