A watch driven by temperature difference! A perpetual motion machine on your wrist.

This is an ultra-cool watch made by Urwerk, inspired by the principles of a traditional air clock. The watch body is fully sealed, so the expansion and contraction of air caused by changes in external temperature can drive the rotation of two mini turbines, which in turn propel the operation of the mechanical components inside the watch. The location of the turbines is also designed to be transparent, allowing you to directly observe the rotation of the turbines from the back. Additionally, the turbines come with a three-setting regulator, enabling you to adjust the speed according to different situations, avoiding any potential damage to the internal components due to excessively fast rotation.