The patented cube mimics food and is designed to fit around a fridge's temperature sensor, which usually measures the temperature of the circulating air.
Because air heats up much more quickly than yoghurt, milk or whatever else is stored inside, this makes the fridge work harder than necessary. With the cube fitted, the fridge responds only to the temperature of the food, which means it clicks on and off less often as the door is open and closed.
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