10 Year Battery, 100M Water Resistant, LED Light with Afterglow, Dual Time, Muli-function Alarm with Snooze1/100 second digital stopwatch, Hourly Time SignalAuto Calendar (pre-programmed until the year 2099)12/24 Hour Formats, Battery CR2025, Approx. battery life: 10 yearsModule 3092/3240
