Astron Solar GPS Chronograph 1500 Piece Limited Edition "Solidity" Titanium Watch Overcharge prevention function Power save function Perpetual calendar to the february 28, 2100 World time function (39 time zones) Dual-time function MOVEMENT TYPE: Solar MOVEMENT CALIBRE: 5X53 +/-15 Seconds per Month with No GPS Signal BAND TYPE: Titanium Bracelet CLASP TYPE: Z-Clasp DIAL COLOUR: Silver WATER RESISTANCE (Metres): 100 CASE WIDTH: 42.7mm CASE DEPTH: 12.2mm GLASS TYPE: Sapphire Crystal DATE FUNCTION: Date Only STONE TYPE: None