The OWL is the first readily accessible hand-held energy saving device to help you save the planet, as well as your pocket. Using the OWL allows you to see the amount of energy we waste in our homes, as it measures the electrical usage of our home appliances. If we then respond by changing our behaviour towards energy use, the OWL really can help us make a difference in the fight against climate change. It cleverly measures electricity consumption using kilowatt hours, it also measures the resulting CO2 emissions in Kg as well as in-home humidity and temperature. Batteries included.