Rosewill Powerbank 11200mAh External Backup Battery Charger - Retail Packaging - Black Capacity: 11200 mAh Micro-USB Input: 5V Samsung Lithium Ion Battery Cells 2 USB Port to charge up to 2 device at the same time Integrated microchip prevents overcharging & lengthens battery life Capacity: 11200 mAh ^Micro-USB Input: 5V ^Samsung Lithium Ion Battery Cells ^2 USB Port to charge up to 2 device at the same time ^Integrated microchip prevents overcharging & lengthens battery life