Astron 5X Titanium Collection. Fifty years ago, Seiko transformed watchmaking with the first commercially available quartz watch, the Astron. Today's Astron 5X Titanium Collection represents another step forward, reflecting the strong, sleek lines of the 1969 original, in light and durable titanium, while providing the highest degree of accuracy possible in a wristwatch — effortlessly. GPS controlled for high-speed time and time zone adjustment to 39 time zones, with daylight saving time function, this remarkable timepiece includes a perpetual day and date calendar correct to the year 2100, dual time with time transfer function, and am/pm indicators. To ensure smooth operation, the watch is equipped with a signal reception result indicator and power save function. The solar cell is powered by light energy, with no battery change required. The black dial also features a date calendar and LumiBrite hands and markers, and is topped by a dual-curved sapphire crystal with super-clear coating. Crafted of stainless steel with a super-hard coating for added durability, secure screwdown caseback, and tri-fold push button release clasp. 20 bar, 200M Water Resistant.