Master monochromatic style with the "Blackout" Nighthawk. The sporty design will strike up a conversation with its distinctive look in all black ion-plated stainless steel and with advanced features, including the 1/5 second chronograph that measures up to 60 minutes, 12/24 hour time and a tachymeter that measures speed based on time traveled over a distance. It also has screw-back case, a bracelet with safety foldover clasp with push button, and water resistant to 200 meters. Featuring our proprietary Eco-Drive technology that's sustainably powered by any light and never needs a battery, this versatile watch stands out is essential for every man's weekday to weekend wardrobe. Caliber number B612. Show Less