Cook soft and hard boiled eggs perfectly everytime. The timer sits in the pot with the eggs and changes color as the eggs cook. Graduated scales show when eggs are soft, medium, or hard by sensing heat instead of time. The sensor accounts for the number of eggs, the amount of water, even the altitude at which the eggs are being cooked. Soft boiled eggs are exactly as you like them... everytime. Hard boiled eggs are no longer over cooked, so they have perfectly colored yolks, and a smooth texture. Made in USA.