Taking it up a notch with the reinvented Citizen Perpetual Calendar Chrono timepiece with a 1/20 second chronograph, perpetual calendar and dual time in a stainless steel case and bracelet completed with a blue-gray dial. Featuring our Eco-Drive technology – powered by light, any light. Never needs a battery. Caliber number E820. Band Color: Silver Band Material: Stainless Steel Band Type: Bracelet Case Color: Silver Case Material: Stainless Steel Case Shape: Round Clasp Type: Fold Over Clasp with Hidden Push Buttons Crystal Material: Mineral Crystal Dial Color: Blue Dial Feature: 3-Hand, Luminous Hands Gender: Mens Case Size: 44mm-45mm Water Resistance: 100 metres