The Arc switch is used to employ a Warning Arc Display. Arc switch functions are described in Warning Arc Display. The weapon will arc for as long as the Arc switch is held down. If there has been a probe deployment, a momentary press of any Arc switch will result in a 5-second activation across the front of the weapon, or across all deployed cartridges. If you press the Arc switch and hold it before releasing it, the discharge ends when the switch is released.