Thermor Bios Wireless Wind Chill and Humidex Thermometer (White, 8.5-Inch x 13-Inch x 3.5-Inch) Wirelessly transmits up to 328 feet and measures/displays humidex and heat stress, wind chill, windspeed indoor and oudoor temp Calculates Humidex which is a combination of temperature and humidity and reflects perceived temperature in warmer months. Calculates wind chill which is a combination of temperature and wind speed and reflects how the air feels in cooler months. Colored scale monitors heat stress index and wind chill index to monitor the safety of outside activities: danger, extreme, cold, comfort, caution, extreme, danger and extreme danger Min./Max. memory