mm is a flashlight providing a wide or narrow array of light for different usecases. A lens is mounted in front of the light to concentrating or dispersing light rays.
The shape of the lens allows five differents position. By rotating the lens, the user can switch from off mode to different light beam: 24mm, 35mm, 50mm and 70mm.
The figures indicating the light rays become visible when the user start to rotate the lens. By pulling the lens the user can have access to the battery.