To provide a visibility function such as emergency display or alarm display.

The case main body 2 of a display 1 includes inside a light source 4 composed of a xenon flash lamp to be flashed and an emitter 5 composed of a light emitting diode, and a condenser lens 3 formed in its outer surface part. This condenser lens 3 executes emergency display or alarm display by emitting a strong flash from the light source 4. Adding to the emitter 5, with providing a self-emitter such as luminous or fluorescent material, an illumination function is reinforced.