Speaking of which, the solar-powered TH50-00 is the result of a partnership between TAG Heuer and the Manufacture of La Joux-Perret based in La Chaux-de-Fonds. The result is a watch that won’t need a battery change due to its re-charging ability. According to the brand, the movement only needs two minutes of direct sunlight to run the watch for an entire day Once it’s fully charged and after less than 20 hours of sunlight, it can run for six months. Once it stops working, it only needs ten seconds of exposure to make it run again. In addition, the watch has a power save mode engaged by pulling out the crown, which extends its autonomy for three-and-a-half years.