Atmos clocks are made by the renowned Swiss company Jaeger LeCoultre. They are a very fascinating clock that do not require winding. They are made entirely by hand and are as high quality as their watches. A temperature change of only 2 degrees F provides sufficient energy for 48 hours. Every piece in the movement of the Atmos is machined to an absolute precision. The minute hand is so perfectly balanced that if a fly could settle on it, it would stop the whole clock.