Honeywell TE821W Wireless Weather Station with Rain Gauge, Wind Gauge, Thermometer Atomic Clock, Barometer Monitors indoor and outdoor temperature and humidity Backlit LED display lights up automatically in low light for easy reading Measures wind speed and direction, wind chill, rainfall, barometric pressure Automatically sets US Atomic Clock for precise time year-round Moon Phase Calendar; measures 18 by 17.4 by 5.3 inches; weighs 5.1 pounds