Propel AC400 4000mAh 5V 2.1A Dual USB Output Mobile Power Bank with Built-in AC Wall Charger 4000mAh LiPO battery with AC plug Double outputs: 2x USB can quickly charge two devices simultaneously on the go Small, portable size make it ideal for traveling (Dimension: 91 x59 x 33mm) It can be used as an AC charger (Propel AC400 supports it supports passive charging) Compatibility: cell phones, smart phones, iPhone, iPod, MP3, and most other mobile devices