Brunton ADC Pro. When weather data matters most, the ADC Pro gathers and records all the key conditions. Keys functions: Displays current relative humidity, heat index, dew point and wet bulb; Relative air density; Air density; Altitude; Density altitude; Displays current barometric pressure (in hPa,mb or Hg); Storm alarm; Displays the past 24 hour pressure tendency; Predicts the coming 12 hour's weather; Altimeter alarm; Ski run counter; Current, max and average wind speed (in km/h, mph, ft/s, m/s, or knots); Current temperature; Past 24 hour temperature tendency; Wind chill, Average wind chill and minimum wind chill; Wind chill alarm; Water flow meter; Real time clock; Time, day and date; Chronograph operation; Race timer; Manual and automatic data logging; IR data communication with PC using ADC-IR. Waterproof. Lanyard. Two year manufacturer's warranty. Clam packed.