With Eco-Drive technology, it is powered by light and never needs a battery, so you'll never need to open your caseback or compromise your dive again. This timepiece features a stainless steel case, black polyurethane strap with emerald green bezel and black dial, one-way rotating elapsed time, 1/5th-second chronograph, 12/24-hour time, date and divers 200M. Caliber number B612.