A light-emitting diode (LED) is used to illuminate the watch face Elapsed time, split time and final time are measured with 1/100-sec accuracy Each time you stop the alarm, it sounds again after a few minutes Once set, the automatic calendar always displays the correct date Times can be displayed in either a 12-hour or 24-hour format Backlight provides visibility in low light Shatter-resistant acrylic window lens Square, high-performance and durable resin case Water resistance up to 50 m