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 modern classic design timepiece features a silver tone stainless steel bracelet and 42mm case, green colour dial and day/date function. 100m water resistant. Ref: BI1031-51X Product Informat Brand: Citizen Movement: Quartz Case Material: Silver Tone Stainless Steel Case Size: 42mm Type of Strap: Stainless Steel Bracelet Strap Glass Material: Sapphire Crystal Dial: Green Water Resistant: 100m Gender: Mens