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 Citizen chronograph mens watch offers refined timekeeping precision. Equipped with Perpetual Calendar technology which only needs to be set once to provide dependable presentation of day, date and month. Features include dual time display and low charge indicator, 100m water resistant. Stainless steel bracelet and 42mm case, black dial. Ref: BL8140.55E Product InformationBrand: Citizen Eco-Drive Caliber 870Case Material: Stainless SteelCase Size: 42mmType of Strap: Stainless Steel Glass Material: Sapphire CrystalDial: BlackWater Resistant: 100mGender: Mens