Mate 2800 is a power bank for mobile devices with LED lighting function, and it is different from normal tube-shaped ones, which are not easy to fix on desks due to their round shape. We applied a triangular prism tube to improve user experience and prevent it from dropping or rolling away. Additionally, the new shape also helps users quickly find the LED lighting switch when moving in dark environment. For better touch feeling and to prevent static electricity generated from bare metal, robber coating is added to the surface and even enhance its quality. The design core of Mate 2800 is making it simple to use and identify.