By simply placing the egg timer and the eggs in the bottom of the pan, covered with at least an inch or two of warm water, this egg timer will calculate the exact cooking stage by temperature. As the egg timer heats up, the red face changes color, indicating soft, medium, hard and stages in between, absorbing heat exactly as an egg does. It is constructed of resin material. The length of this product is 5.5cm, the width is 4cm and the height is 3.2cm. It is highly recommended for those who has trouble boiling the perfect eggs, and great for family and friends. Item Name: Egg Timer Material: Resin Features: Reusable, Food Grade, Smooth Surface Size Details: L: 5.5cm/2.17", W: 4cm/1.57", H: 3.2cm/1.26" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Egg Timer