... connection to 2 A2DP source devices for music playback,AUDIO:* Frequency Response:20 Hz - 20 KHz, Very high Signal to Noise ... Ratio(SNR ):95 Db, TotalHarmonic Distortion(THD):0.1%,* Frequency Response:60 Hz - 20 kHz* 2W Speaker Output Level:80dB ... ,Interface:* 4 Button design: MFB, VOL+, VOL-, Slide switch,* LED Status Indicator: Blue, Red,* Mini 5 Pin USB charging Port* Color: greenPOWER ...