DESCRIPTION Simplicity and convenience with just three hands and a date calendar. This Seiko Astron GPS watch features Calibre 3X – the very latest Astron GPS Solar movement. In size, in energy efficiency and in signal reception, it demonstrates how far Seiko’s technology has come since the introduction of the first GPS Astron Solar watch. The case is less than 40mm in diameter thanks to the reduced GPS reception antenna that uses components distributed across a single plate. The watch maintains the same high level of reception performance and offers a power reserve of approximately six months. Conveniently solar-powered; the watch charges from both natural and electric light. Seiko Astron: the world’s first GPS solar watch – powered by light, automatically adjusted to your time zone through the latest GPS technology. Movement Caliber Number: 3X22Movement Type: GPS solarAccuracy: ±15 seconds per month (without receiving a GPS signal and at temperatures between 5°C and 35°C ) Exterior Case Material: Titanium (super hard coating) with ceramic bezelCrystal: Sapphire crystalCrystal Coating: Super-clear coatingLumiBrite: Lumibrite on hands and index(es)Clasp: Three-fold clasp with push button release Other Details Water Resistance: 20 bar Case Size Thickness: 12.3mmDiameter: 39mmLength: 46.1mm Weight: 99.0g Other Specifications Against an allergic reaction to metal Clasp with Smart Adjuster function Screw case back Other Features Automatic hand position alignment function Function to prevent the GPS signal reception (in-flight mode) GPS signal reception function (Time zone adjustment, automatic time adjustment, manual time adjustment) Overcharge prevention function Perpetual calendar to the February 28, 2100 Power save function Reception result display function Not included in any Sale or Promotion - More Information