The Oceanus is billed as the world’s first solar atomic chronograph. With features such as a large-capacity rechargeable solar battery which allows many energy hungry functions to run smoothly, giving you a timepiece that keeps running without the need for battery replacement. It also receives calibration signals from five transmitters around the world and updates its settings accordingly for pinpoint accuracy, even updating itself for daylight savings time. Since Oceanus is the luxury line made by Casio, you’re guaranteed a durable watch that can survive no matter the beating it takes.  [$900 at ewatches]