Multi-functional Power Bank Series product is the product that has most secure, less self-discharge rate, maximum current output rate, the longest battery life, high-efficiency multi-modes lighting, 5V-USB output, 12V output. The most powerful design is the 12V large current output system. It not only provides power for the 12VDC electronics, like air pump, car cams, but also can provide the large current output for vehicle start.