Designed for professional use with a design nod to the 1989 Promaster Sky, the 30th Anniversary Satellite Wave GPS, is all that an more. Within a Super Titanium™ case and bracelet lies a multi-layer black dial featuring satellite timekeeping technology with synchronized time adjustment in 39 time zones, chronograph, power reserve indicator, perpetual calendar, alarm and light level indicator. Limited to 1,989 pieces worldwide with custom 30th Anniversary caseback. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number F990.