Take to the skies with the new Promaster Sky, featured in Super Titanium? andRadio-Controlled Atomic Clock Synchronisation for superior accuracy in 24 worldwide cities, 1 second chronograph measuring up to 60 minutes, anti-magnetic, anti-shock, alarm, 12/24 hour time, perpetual calendar and a compass ring rotating bezel. Featuring our Eco-Drive technology ? powered by light, any light. Never needs a battery.