This Astron GPS Solar watch is a limited edition of 1,500 pieces. It uses the 3X62 caliber with a precision of ±15 seconds per month and a power reserve of approximately 6 months. The case is made of titanium with a super-hard coating, and it has a sapphire crystal with super-clear coating. The watch includes functions such as a perpetual calendar, power reserve indicator, and GPS signal reception function. It is water-resistant up to 10 bar.