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- The Atmos clock is a mechanical pendulum clock powered by temperature fluctuations using a sealed capsule of ethyl chloride gas that expands and contracts to wind the mainspring.
- A temperature change of just 1°C generates enough energy to run the clock for 48 hours, eliminating the need for manual winding.
- The first Atmos models (Atmos I) used a mercury-based motor, later replaced by a gas-filled metal bellows in Atmos II (1935-1938) due to safety and durability concerns.
- The caliber 526 (Atmos V) enabled mass production, while the caliber 540 (1983) introduced a slimmer design, moon phase complication, and improved bellows manufacturing.
- Special editions include the Atmos Jubilee, Atmos Atlantis, and Atmos du Millenaire, which features a perpetual calendar showing years up to 3000 AD.