Casio "Illuminator" W-201-1BV for men features a 36mm resin case with matching black resin band. The digital Illuminator dial features an LED Backlight with Afterglow, and is powered by a CR2016 style battery, which is rated to last (Up To) 10-Years before needing servicing. Additional Features include a Daily Alarm, Hourly Time Signal, and 1/100-Second Stopwatch w/ a Measuing Capacity of 23:59'59.99"