Black ion-plated stainless steel case with a black polyurethane strap. Fixed black ion-plated bezel showing tyachymeter markings. Blue dial with luminous black hands and index hour markers. Minute markers. Tachymeter around the outer rim. Dial Type: Analog. Luminescent hands and markers. Date display between the 4 and 5 o'clock positions. Chronograph - three sub-dials displaying: 60 second, 60 minute and 24-hour. Eco-drive movement. Scratch resistant mineral crystal. Pull / push crown. Solid case back. Case diameter: 48 mm. Case thickness: 14 mm. Round case shape. Band width: 24 mm. Tang clasp. Water resistant at 100 meters / 330 feet. Functions: chronograph, tachymeter, date, hour, minute, second. Sport watch style. Watch label: Japan Movt. Item Variations: CA4155 12L, CA4155.12L, CA415512L. Citizen Ecosphere Eco-Drive Chronograph Blue Dial Black Polyurethane Mens Watch CA4155-12L.