Digital Thermometer, Sensor Temperature Range -40 Degrees to 158 Degrees F/-40 Degrees to 70 Degrees C, 1 Percent to 99 Percent, Number of Sensors 1, Transmission Range 330 ft, Primary Scale Outdoor Humidity/Temperature, Base Power Source Details (3) AA Batteries, Base Temperature Range 32 Degrees to 122 Degrees F/0 Degrees to 50 Degrees C, 4 13/16 in H x 1 3/4 in W 2-Digit Backlit LCD Display - 3/4 in Digit Height, 3.8 in W x 8.8 in H (Base)/1.6 in W x 4.8 in H 0.9 in D (Sensor) The AcuRite Wireless Indoor/Outdoor Thermometer delivers reliable and precise temperature and humidity readings. The easy-to-read LCD screen displays the current indoor and outdoor temperature and humidity. Other features include trend indicator arrows, daily high/low readings, moon phase, plus time and date. The Intelli-Time comes pre-set to the correct time and automatically updates itself for Daylight Saving Time. The digital thermometer display stands upright for tabletop use and is wall-mountable. The outdoor temperature and humidity sensor features powerful wireless transmission technology, a weather-resistant design, plus an integrated hanger for easy mounting.