... :500PCS double usb output 5V li-ion battery pack for moble phoneSpecificationsWeight: 250gCapacity: 6600mAhCell type: Lithium-ion battery Dimension: 90mm*70mm*21mm Output 1:5V ... , MP3,MP4, PMP, GPS, Bluetooth, digital cameras. usb 5v battery portable power portable battery pack double usb output 5V li-ion battery pack for moble phone