Mode-A Fog- Aim at target object and short press power button. Then, the distance value will be displayed on lens. Fog mode needs to be more than 30 yards Mode-B Speed- Aim at the object and short press the power button. Keep aiming as the object moves until the speed value displays on the screen. Mode-C Distance- Single distance measuring: Aim at target object and short press power button to start measuring. The measuring result would be displayed on the lens.