Displays heat index, temperature, humidity and dew point. Ideal for monitoring outdoor conditions for athletics. Danger icon with audible beep. Min/max memory with reset feature. Data hold. Reset feature. F or C readings. Large digital display. Auto power off with low battery indicator. Heat idex range: 32 to 140 F (0 to 60 C). Temp. range: -4 to 122 F (-20 to 50 C). Humidity range: 0 to 100 percent RH. Dew point: -22 to 122 F (-30 to 50 C). Temperature accuracy: plus/minus 1.8 F (1 C). Humidity accuracy: plus/minus 5 percent. Dew point accuracy: plus/minus 3 percent. Dimensions: 6.88 x 1.57 x 0.91 in. Power source: 1 CR2032 battery. Includes: Pocket clip on back and battery.