Using your Seiko Prospex watch is easy. Simply set the time and date according to the instructions in the manual. This solar - powered watch charges when exposed to light, so make sure to let it soak up some rays regularly. For water resistance, it can handle splashes and short swims up to 100 meters, but avoid high - pressure water like diving with scuba gear. To keep it in good shape, wipe the watch with a soft, dry cloth after use. Don't use harsh chemicals on the band or crystal. If you have any issues, take it to an authorized Seiko service center.