... external battery pack: 1.Can charge for all 5 voltage digital products like mobile phones, MP3,.MP4 and PSP ,such ... brands mobile phones(Nokia,Samsung,SonyEricsson,Siemens,Motorola)Apple iPod nana,iPod Classic,iPod Touch,Apple iPhone/iPhone 3G/3GsBlackberryDigital Camera,MP3/MP4 ... over charging, over discharging and short circus, so that your digital products cant be harm any 6.Can compared with iPhone ...