An integrated circuit includes a voltage generator with a first controllable resistor and a second controllable resistor, through which a first input terminal that applies a first voltage potential and a second input terminal that applies a second voltage potential can be connected to an output terminal that generates an output voltage. The events may include alarms or alerts, such as alarms or alerts associated with a resource reaching or exceeding a threshold. The method and apparatus may restrict its service to only specific applications suitable for the environment and the time.