Tech4o Data Center II Multi Function Outdoor Tool Altimeter;Current altitude and 24 hr history graph. Barometer:Current pressure and 24 hr history graph Thermometer, Weather Forecast, and Digital compass Time Date Day with 2 daily alarms Cronograph, Countdown Timer, and Pacer Water resistant:50M, Low battery indicator, and EL Backlight Multi-functional outdoor instrument that isn't worn on wrist; ideally sized for shirt pocket, or clip it to lanyard and wear it around neck Altimeter, dual zone time/date/day plus stopwatch, barometer, digital compass, weather forecast, thermometer, two daily alarms, chronograph, and countdown timer Electro-luminescent (EL) backlight, low battery indicator; user-replaceable CR2032 battery Measures 2.1875-by-3.75-by-0.813 inches (W x H x D); 2.2-ounce weight Includes limited one-year manufacturer's warranty