The automated COSC-Accredited PF441 chronometer movement that this Parmigiani traditional runs on provides a 55-hour electrical power reserve, owing to its oscillating mass, that is in delicately engraved gold, and will be admired with the sapphire crystal caseback. And admire it you are going to, since it displays a lot https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/