Abstract: A liquid presence detecting device that has a simple and compact configuration, and which is high in efficiency, and an air improving device including the detecting device. The liquid presence detecting device includes a magnesium-air battery, and an electrical load. When liquid exists in a detection point, the magnesium-air battery operates (generates electricity), and, when liquid does not exist in the detection point, the operation of the magnesium-air battery stops. Therefore, the liquid presence detecting device detects the presence of liquid, and functions also as a power supply. The air improving device includes the liquid presence detecting device functioning also as a power supply, a device body, and an air improver which is detachably attached into the device body.

Abstract: Provided is an emergency light that can be readily carried by a person even when the person goes outdoors and that can signal occurrence of an emergency. The emergency light includes an illumination light emitting unit that emits light for illumination to a surrounding, a signaling light emitting unit that emits light for signaling occurrence of an emergency to the surrounding, the signaling light emitting unit being provided separately of the illumination light emitting unit, and a transmitter that transmits identifier information over a predetermined area when the signaling light emitting unit has emitted a signaling light.

Abstract: A liquid presence detecting device that has a simple and compact configuration, and which is high in efficiency, and an air improving device including the detecting device. The liquid presence detecting device includes a magnesium-air battery, and an electrical load. When liquid exists in a detection point, the magnesium-air battery operates (generates electricity), and, when liquid does not exist in the detection point, the operation of the magnesium-air battery stops. Therefore, the liquid presence detecting device detects the presence of liquid, and functions also as a power supply. The air improving device includes the liquid presence detecting device functioning also as a power supply, a device body, and an air improver which is detachably attached into the device body.