Seiko Men's Astron GPS Solar Date Calendar Titanium Watch SAST019 Imported Operates on Solar GPS Satellite Radio, Smart sensor with Automatic time correction function Bright titanium Case with Ceramics & Hard coatings Accuracy 15 seconds per month Lumi brite (needle , index), Time zone correction by GPS Power saving function,Battery life time Approx 6 months, Charges by the Sun (Solar)