Cartier presents the ID Two concept watch, an efficiency optimized, ultra-lightweight timepiece equipped with revolutionary movement that's housed in a sleek and transparent Calibre de Cartier Ceramyst case. The watch stores 30% more energy than its conventional counterparts, thanks to twin Duolevel barrels equipped with two fiberglass springs for each. It also transmits 25% more energy via a revolutionary new gear train. The upshot is Cartier's first high efficiency watch, with 32 days of power reserve and a unique vacuum-sealed case with no screws. Check out more looks below, as well as a short video overview.