LCD displays temperature and humidity, Wireless transmission range up to 100 feet (line of sight), Weather-resistant, User-selectable units (Fahrenheit or Celsius), Three channel capability, Humidity range accuracy from 25 to 90 percent, Outdoor temperature range -4 to 158 degrees F with alkaline batteries, Outdoor temperature range -38 to 158 degrees F with lithium batteries, 2 AA batteries required (not included)