Indoor/outdoor temperature and humidity. Large, easy-to-read display. Trend line. Daily high and low. Enhanced wireless sensor goes through walls better. 165 Ft. range. Temperature range from -40 deg. F. to 158 deg. F. Fahrenheit or celsius. Plastic case. 3.5 In. W. x 5.5 In. thermometer, 1.6 In. W. x 4.8 In. H. sensor. Main unit uses 3 "AA" batteries (not included). Sensor uses 2 "AA" batteries (not included).