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. The new Stiletto Modern is contemporary and sleek at just 4.7mm thick with a black Guilloché dial. Stainless Steel bracelet and 38mm case, black dial. Ref: AR3070-55E Product InformationBrand: Citizen Eco-Drive Case Material: Stainless SteelCase Size: 38mmType of Strap: Stainless Steel Bracelet Strap Glass Material: Sapphire CrystalDial: BlackWater Resistant: 30mGender: Mens