Wind speed measurement - current and maximum wind speeds. Measures wind speed up to 67 mph (108 Km/h). Wind measurement units - m/ s, Km/h, ft/sec, knots, mph. Current temperature - measures in °F (Fahrenheit) or °C (Celsius). Altimeter - measures altitude in feet or meters - up to 29,500 ft/ 9000 m. Barometer - measures barometric (atmospheric) pressure - measured in inHg or hPa. Hygrometer - measures percentage of relative humidity. Time - current time. Wind chill reading. Backlight - for easy reading in the dark or dim light. Impeller (fan/vane) - 0.6" (14.2 mm) diameter. Low battery indication. CR2032 Battery included. Weather resistant. Lanyard included. Carrying pouch included.