You'll always know the current temperature and humidity levels, both inside and out, with this Wireless Indoor/Outdoor Thermometer. Updated every 30 seconds, the monitor features precise, reliable temperature and humidity readings from a weather-resistant sensor placed in your backyard, job site, or wherever your next project takes you. The bold LCD screen also displays trend arrows, daily high and low information, and the date and time. The sleek, modern design allows for perfect placement in any room. The durable, all-weather sensor has a wireless range of up to 165 ft. (50 m) from the display. The display is powered by (3) AAA batteries (not included), and the sensor is powered by (2) AA batteries (not included).