Seiko Astron x GPS Solar ft. Dual-Time Chronograph Men Formal Round 100m Water Resistant Watch SSH153J1 SSH153 SSH-153 SSH-153J1 Experience cutting-edge precision with the Seiko Astron GPS Solar Chronograph, featuring the new Caliber 5X83 movement with 1/20-second stopwatch and dual time display. The high-contrast dial, ceramic-titanium bezel, and dual-curve sapphire crystal combine sporty elegance with advanced functionality. Lightweight titanium case ensures comfort, while instant time transfer enhances global usability. Caliber Number / Movement 5X83 (solar powered) Power Reserve / Accuracy Approximately 6 months when fully charged (+/-15 seconds per month without GPS signal) Crystal Sapphire crystal (dual-curved, super-clear coating) Luminous LumiBrite on hands and indexes Case / Band Material Titanium (super-hard coating) case, ceramic / titanium bezel with titanium band (three-fold clasp with push-button release, smart adjuster function) Water Resistance 100m / 10 bar Case Size Thickness: 13.4 mm Diameter: 43.3 mm Length: 49.5 mm Lug width: Integrated Other Specifications Seiko Astron x GPS Solar ft. Dual-Time Chronograph Made in Japan Magnetic resistance (4,800 A/m) Allergy-safe metal Screw case back DST (daylight saving time) World time function (38 cities) Time transfer function (switching between main and sub-dial) Perpetual calendar (to 28 February 2100) Chronograph up to 12 hours in 1/20-second increment Power reserve indicator Overcharge prevention function Power saving function (hands stop to save power when left in the dark) Automatic hand position alignment function Day, date, 24-hour and dual-time display Regular timekeeping (analog display) GPS Function GPS signal reception function (time zone adjustment, automatic time adjustment, manual time adjustment) Reception result display function Satellite acquisition status display function Function to prevent the GPS signal reception (in-flight mode)