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

This is an ultra-cool watch made by Urwerk, which draws inspiration from the principle of traditional air clocks: 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 micro turbines, thereby powering 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 are equipped with a three-position regulator, enabling you to adjust the speed according to different situations, avoiding any potential damage to the internal components due to excessive speed.