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 Corso Sapphire model is a time-honored watch with clean lines and simple accents that will never go out of style. Featured here in stainless steel with charcoal grey dial, rose gold-tone accents, sapphire crystal and date. Ref: BM7251-53H Product Information Brand: Citizen Eco-Drive Case Material: Stainless Steel Case Size: 41mm Type of Strap: Stainless Steel Bracelet Strap Glass Material: Sapphire Crystal Dial: Grey Water Resistant: 100m Gender: Mens