Designed for extreme depths Citizen BN1024-01E Promaster Marine is a professional diving watch made for serious adventurers. Thanks to its impressive water resistance of 300 meters, this watch is perfectly suited for scuba diving. The robust housing, advanced technology and durable materials make it an ideal partner under harsh conditions. * Water resistance: 300 meters, suitable for professional diving * Case: 46 mm stainless steel with scratch-resistant sapphire glass * Movement: Eco-Drive Caliber E365 with 365 days power reserve * Band: BENEBiOL™ polyurethane, environmentally friendly and resistant to seawater * Extra functions: Helium escape valve, luminous hands and bezel Reliable energy source With the innovative Eco-Drive system you never have to replace batteries. This watch charges itself via light – sunlight or artificial light – and has an exceptional power reserve of 365 days. Even if you don't wear it for a while,