... P-MAX Mini Speaker is one low-voltage and low-power consumtion mini speaker, which supports 2.5/3.5 ... output, such as mobile phone, iPad, iPhone, Touch, MP3, MP4, notebook PC and desktop PC, PSP etc., unique stereo vocal cavity ... , audio data cable (USB charging), instruction bookTechnical Parameters:Output Power:3W Response Frequence:100HZ-15KHZBattery:Rechargeable Battery 280mAHOutput Resistance:4 ...