The core is made of natural pebbles in natural form, abandoning the rigid shape of the traditional charging treasure, and adopting a large curvature and round curved surface to be integrally formed. The outline is smooth and free of sharp edges and corners. When holding it, it fits the radian of the palm. When holding it with one hand and putting it in a pocket, it will not pinch the hand, creating a bionic and natural hand feeling. Portable short-distance travel two kinds of use needs.