Citizen’s simple yet revolutionary Eco-Drive technology harnesses the power of light, whether natural or artificial, and converts it into energy, storing the surplus in a power cell. Designed to charge from any form of light source, from sunlight to desk lamps, you can go about your daily life and be confident that your Eco-Drive won’t stop. This 3-hand model include luminous hour and minute hands and markers, along with a date indicator and sapphire crystal. The 43mm case and bracelet are crafted from titanium, which is 5x harder and 40% lighter than stainless steel. Ref: BM7431-51L Product InformationBrand: Citizen Eco-DriveCase Material: Titanium Case Size: 43mmType of Strap: Titanium Bracelet StrapGlass Material: Sapphire CrystalDial: Blue Water Resistant: 100mGender: Mens