... is 3000PCS (logo customized)Working Principle:This portable power pack/mobile power supply adopts high-performance lithium-ion polymer, with capacity ... can charge various digital devices: mobile phone, PSP, PDA, MP3 player, MP4 player, PMP, etc. via correct USB/DC ... USB charging function by different connectors: Mobile Phone, IPOD, PSP, MP3 player, MP4 player, PMP, GPS, Bluetooth, digital camera, etc ...