Travel with confidence without ever having to worry about your smart phone or tablet running out of power with this three disk stackable power Bank from Sungale. Each disk of this uniquely designed battery charger has a 3000 mAh charging capacity. When stacked together, the three disks combine to Triple the charging capacity to 9000 mAh. Disks can each work independently to each charge separate devices or stacked together to increase the charging capability of a larger device. Take all three disks with you where ever you go or if you don't think you'll be needing that much power, you can leave two at home, and take the other with you. These disks are are each small enough to tuck inside a pocket or stow away in a purse, briefcase, or backpack without taking up much space at all. If you want to increase the overall charging capacity even further than 9000 mAh, additional disks can also be added (sold separately) and stacked on top of the three disks. Each three disk power Bank set a charging cable with Multiple device connections which will charge most smart phones or tablets. Available in two color combinations.