The invention concerns a toothbrush, elongated in shape, comprising bristles, and arranged to have on a horizontal flat support at least a stable equilibrium position wherein the longitudinal direction of the toothbrush is substantially parallel to the support and the bristles extending at some distance from the support and towards the support. The apparatus includes electro-optical devices to detect and identify objects, a control unit, which receives and processes information from the devices and a vocal representation unit to receive instructions from the control unit for purpose of audibly describing the objects to the person in the field of vision, thereby enabling the person to cope and proceed safely in the surroundings. A first image processing part performs a first image processing task on original image data provided from the exterior by using the line data stored in at least one of the line buffers. The jewelry box has a bottom tray and an upper tray each having divided compartments. Thus, the nitride semiconductor thin film can be usefully employed in optical devices such as light emitting diodes and electronic devices.