The standard electrical plug, with male and female sections for connection of an appliance to the mains supply, has an insulated housing with a visible colored LED display. A data processing unit within the housing takes data from sensors on the ambient environment by remote data transmission. The data can be the CO2 value and/or the CO value and/or incoming light and/or floating matter and/or smoke and/or hazardous and/or dangerous matter and/or temperature and/or moisture.
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