Tag Heuer’s Monaco V4 is a concept watch that “uses belts instead of gears,” which creates a lot less friction than cogs driving one another. Video after the jump.
To generate energy, a platinum ingot slides back and forth as you move your wrist. A series of 0.5-millimeter-wide belts transfers this energy to four spring-wound barrels. The barrels employ more belts (13 in all) to run a balance wheel that translates this energy