SEIKO PROSPEX STREET SERIES SOLAR TUNA 200M WATCH - Solar Diver - Powered by light energy-no battery change required - 10-month power reserve once fully charged - Accuracy ±15 seconds per month - Date calendar - Screw down crown - Screw case back - Unidirectional rotating bezel - Lumibrite on hands and indexes - Hardlex Glass - Case diameter: 46.7mm - Thickness 12mm - Stainless steel case - Water Resistance: Diver's Watch to 200 meters (660 feet). Meets ISO standards and is suitable for scuba diving. - Silicone strap