... Digital MINI card small speakers-Stereo sound,ultra-low sound powered from the phone.-Support USB,SD card,computer,mobile phone, ... IPOD,PSP,MP3,MP4 to listen to music-Have audio interface,can ... and delicate your MP3, MP4, CD or notebook computer audio etc. For better efficacy. Reference coefficientOutput powerFrequency responseSNRCharging timeWorking ...