See the Defy El Primero movement which flaunts standout performance: a COSC-certified in-house movement driving a hundredth of a second display by means of a central hand, with its unique and exclusive dynamic signature of one rotation per second. 

Its double-chain structure is based on two regulators, made of Carbon-Matrix Carbon Nanotube composite, a patented new material that is insensitive to magnetic fields and temperature gradients to a degree well above existing norms.

SOURCE:http://en.worldtempus.com/article/watches/trends-and-style/zenith-defy-el-primero-21-23665.html