Play the songs of TF card Built-in battery,3.7V(500mA/h) FM function Color:white, black, red,yellow The main technical parametersSpeaker interface:DC-5V/USB,LINE INBattery / power supply:Built-in, 3.7V(780mAh)Audio formats:MP3Output power:4wPeak power:4wSensitivity:90dBFrequency Range:90-120000HzSignal to noise ratio:>85dBBass boost/attenuation90dBTreble upgrade/attenuation80dBTweeter ...