Patent ID: 8742716

Claim:
An information output apparatus comprising: a body that has a first battery and an output unit, said first battery being a rechargeable battery, said output unit outputting information; a base station that is fixed to a car and supports said body that is detachable; a first detector that detects the ON/OFF state of an accessory power supply of said car to which said base station is mounted; and a transmitter that wirelessly transmits detection results of said first detector as a first information; said base station having a power generator that converts at least one of light, heat, wind, or vibration to electrical energy, and being a cradle for said body; charging said first battery being performed on the basis of electrical energy generated by said power generator, without using electrical energy charged in a car battery; said body operating on the basis of electrical energy that is either generated by said power generator or charged in said first battery, without using the electrical energy charged in said car battery; wherein at least one of said base station or said body has a receiver that receives said first information from said transmitter; said body has a controller that controls the ON/OFF state of said body on the basis of said first information.