A sporty look for day or night, this Silhouette model in stainless steel two-tone with black dial complements any look. Features include a refined 21 mm case and jewelry clasp with push button. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number B023. Movement Technology B023 Eco-Drive Powered by any light source, continuously and sustainably, eliminating the need to replace watch batteries. Band Length 184.15 mm Case Width 21 mm Lug Width 10 mm Band Type Bracelet Stainless Steel Case Material Two-Tone Stainless Steel Crystal Mineral Crystal Impact and shatter-resistant Clasp Jewelry Clasp with Push Button Dial Black Water-Resistance WR [Splash Resistant] Additional Functions 2 Hand