A light emitter (LED) is used to illuminate the watch dial. 1/100 second chronograph. 24 hour chronograph 1/100 second. 24 hours Precise elapsed time measurement at the touch of a button. The unit of measurement is 1/100 second, the maximum measurement is 24 hours. Long battery life (10 years). Full automatic calendar Full automatic calendar Months with different amounts of days, including leap years, are automatically indicated. The normal time indicator of 12/24 hours The normal time indicator of 12/24 hours Hours are displayed in either 12 or 24 hour format. Water Resistant (10 Bar) Water Resistant (10 Bar)