Abstract: It is an object of this invention to provide a sea rescue informing apparatus and a life boat comprising the sea rescue informing apparatus. The sea rescue informing apparatus can securely inform a rescuer about the current position of a sufferer by continuously operating a rescue informing device with no fear of electric power consumption.

Abstract: A power source of an audio apparatus loaded on a car is a battery with a rated voltage of 12V or more. An electrolytic capacitor unit is utilized as a power source filter in the audio apparatus. As the electrolytic capacitor unit, a given number of aluminum electrolytic capacitors with the same rating is connected in parallel to gain a capacitance of 1 F (farad) or more and an internal resistance of less than 1.0 m&OHgr; as a whole. Thus, the electrolytic capacitor unit can provide, in addition to a large capacitance necessary for a power source filter for an audio apparatus, sufficiently low internal resistance and stable output voltage.

Abstract: A portable lighting instrument having a light emitting diode assembly capable of being applied to a lighting system for a helicopter taking off and landing place. The system is constituted by a lighting instrument including a heliport lighthouse installed in a fixed position temporarily determined as a temporary taking off and landing place for a helicopter, a wind lamp, a landing area lighting lamp, a boundary guide lamp, and a boundary lamp. For at least the boundary guide lamp and the boundary lamp out of these lighting instruments, the portable lighting instrument according to the present invention can be used. The lighting instrument comprises a casing; a solar cell disposed on the outer surface of the casing; an electrical double-layer capacitor placed in the casing and charged by the solar cell; and a light emitting diode assembly disposed on the top of the casing and lighted by a current supplied from the electrical double-layer capacitor.