Portable alarm apparatus for warning a person is provided which includes a manually portable housing or base unit; a constant power supply supported by the base unit, the constant power supply including an external power supply having an interface connectible to a power source external of the base unit, the constant power supply including an onboard power supply independent of the external power supply whose makeup includes at least one of: photovoltaic, piezoelectric and thermoelectric; a detection circuit supported by the base unit, the detection circuit being connected to the constant power supply, the detection circuit being operable to detect a monitored condition, the detection circuit including at least one of: a smoke detector, a carbon monoxide detector and a fire detector; and an alarm circuit supported by the base unit, the alarm circuit being connected to the constant power supply, the alarm circuit being operable in response to detection of the monitored condition by the detection circuit to produce an alarm signal for warning a person.

 
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