The mouse PiepEi plays three different melodies for three degrees of hardness THE PROGRAM WITH THE MOUSE - for wimps MY GRANDMA RIDES IN THE CHICKEN... - for medium-soft eggs OLD MACDONALD - for hard eggs The mouse peepei guarantees the perfectly cooked egg. No matter the conditions under which you cook the eggs. Sounds funny — but that's the way it is. Too soft, too hard — but never to the point. Perfectly cooked eggs are a science in themselves. But not a problem for the PiepEi. Simply store with the eggs, cook with the eggs and wait until the mouse sings PeepEi. No matter what water temperature you start with, no matter how many eggs you cook and no matter at what height you use PiepEi - the egg will be perfect, because PiepEi works anytime and anywhere. PiepEi measures the outside temperature with a sensor and calculates the internal temperature in the egg using a differential equation. That was... physical. The mouse beeps. A nice memory of childhood and the perfect gift for all explanatory bears