'Accelerator' is both passive and active in usage, being constantly applied to Accelerator himself to block out sound, sunlight, and other vector-based properties. This ability requires a great amount of calculating power from Accelerator, forcing him to take into account every vector he intends to manipulate, as well as any outside factors, such as wind turbulance, oxygen, heat, moisture, air density, etc. In short, he has the ability to control vectors (magnitude and direction) and influence objects that have vectors such as bullets, heat, and electricity.