The Citizen Promaster Marine Eco - Drive BN0190 - 15E is perfect for divers and water sports enthusiasts. You can wear it while diving up to 200 meters deep or during other water - based activities. With its solid stainless - steel case and black polyurethane strap, it's both durable and comfortable. The watch uses Eco - Drive technology, so you don't need to worry about changing batteries. The luminous hands and markers make it easy to read the time in any light conditions.