Needs battery! Easy replacement! White acrylic case with a white acrylic bracelet. Fixed silver-tone bezel. Digital dial displaying: hours, minutes, seconds, am/pm, date and day of the week. Other functions: Alarm and stopwatch. Push-button electroluminescent (EL) backlight. Quartz movement. Stainless steel case back. Case dimensions: 38.5 mm x 45 mm. Case thickness: 12.6 mm. Tang clasp. Water resistant at 50 meters / 165 feet.