... several voltage output,applied to digital products4) The capacity of lithium polymer battery Built-in 7V ... /1300mAh5)The mp3 player built-in ,support the system (windows98/SE/ME/2K ... LINUX2.4.2) 6)Speaker built-in (support the speaker play) 7)Support amounts of Audio Format ... 8)Support USB2.0 transmit and can charge for the cellphone,psp,Ipod ,digital cameras,DV ,PV solar charger ...