Add this disk to the Sungale two or three disk Round Stackable Power Bank (model SPB0200 or SPB201) to increase its charging capability of a smart phone or tablet by 3000 mAh. Travel without having to worry about your device running out of power. Each disk can also work independently to charge a device. It's small enough to tuck inside a pocket or stow away in a purse, briefcase, or backpack without taking up much space at all. Each disk includes a charging cable with Multiple device connections which will charge most smart phones or tablets. Available in two colors.