@matigo They aren't svelte. Big weighted pendulum turns a shaft at very high rpms. The generated electricity is stored in a lithium ion cell. Most of these things are men's watches only because of the size of the movements.
@matigo They aren't svelte. Big weighted pendulum turns a shaft at very high rpms. The generated electricity is stored in a lithium ion cell. Most of these things are men's watches only because of the size of the movements.