Indoor temperature & humidity. Indoor/Outdoor Humidity range 10% to 99%. Indoor temperatire ramge 32-140℉, outdoor temperature range 40-140℉. Temperature unit: ℃/℉. Comfort level and rate of change indicators. Min/Max Memory for temperature & humidity. Monitors temperature and humidity in up to 8 remote locations. Optional remote sensor transmission range of up to 300 feet line of sight (100 feet under most conditions). Line of sight wireless transmission (in open air): 90 meters, 30 meters under most conditions.