The PiepEi Hartmut plays a melody for a degree of hardness: I WISH I WAS A CHICKEN - for hard eggs PiepEi Hartmut is one of Brainstream's three BeepEi classics. Detlef, Schantall and Hartmut were the first BeepEi Brut, each patron for a degree of hardness. Great for anyone who knows what they want PiepEi Hartmut takes care of the hard-boiled eggs. Too soft, too hard — but never to the point. Even the perfect hard-boiled egg is a science in itself. Anyone can cook hard because of it. But no problem for PiepEi Hartmut. Simply store with the eggs, cook with the eggs and wait until the beeping Hartmut sings. No matter what water temperature you start with and no matter at what altitude you cook, the egg will be perfect.