Eco-Drive - runs on light never needs a battery replacement. Atomic Timekeeping technology with synchronized time adjustment available in 24 Time Zones. Silver-tone stainless steel bracelet case and bezel. Green dial with 1-second chronograph measures up to 60 minutes. Features perpetual calendar power reserve indicator and 12/24 hour time. Green ion-plated rotating bezel and tachymeter. Sapphire crystal window. Double push button fold over closure. Lug width: 26.7mm. Case size: 46mm. Water resistant to 200 M. 5-Year manufacturer limited warranty.