Egg timer darkens as eggs cook. Simply place timer with eggs in a single layer at the bottom of a pan. Cover with at least an inch or two of room temperature water. This egg timer will take the guess work out of boiling eggs! As the timer heats up, the red face changes color, indicating soft, medium, hard and stages in between, absorbing heat exactly as an egg does. The result is the perfect boiled egg! Calculates cooking stages precisely by temperature, not loosely by time Colour Changing Egg Timer | Living Social | Living Social