Casio's W218H-1BV Illuminator comes equipped with a durable 43.2 mm resin case with matching black (Buckle) style band. Additional features include a 1/100 second stopwatch with a measuring capacity of 59' 59.99"" a Daily Alarm w/ Hour Time Signal function 50M Water Resistance and an LED Backlight. The included CR2016 style battery ensures long-life without needing a replacement/service.