This kind of mobile power bank can provide sufficient backup power of great capacity 16800mAh for iPhone, iPad, Samsung, Tablet PC, DV, PDA, iPad, etc. and it is also compatible with common mobile phones, digital camera, MP3, MP4, PSP, and GPS, or digital devices with homologous plug(as the pictures shown). There are 2 indication lights for showing charging condition. Moreover, you also can treat the three LED lights as torch at dark night.