Seiko SSH111J Astron GPS Solar Mens Watch • Power save function • Overcharge prevention function • Perpetual calendar to the february 28, 2100 • World time function (39 time zones) • Dual-time function • Day display • Power reserve indicator • Time transfer function (Switching between the main-dial and sub-dial) • Automatic hand position alignment function • GPS signal reception function (Time zone adjustment, automatic time adjustment) • Satellite acquisition status display function • Reception result display function • DST (Daylight Saving Time) • Function to prevent the GPS signal reception (in-flight mode)