Hang this sizable 18" weatherproof clock on the house or garage and it will be easy to see the exact time at a glance. Radio signals from the atomic clock in Greeley, Colorado, ensure perfect accuracy, including automatic updates for Daylight Savings Time. Analog sensors on face show relative humidity and temperature, too. Large, easy to read face Precise atomic time Also displays humidity and temperature Uses one AA battery, sold separately Weatherproof plastic with pewter finish Measures temperatures from ???10 to 130 degrees F Keyhole hanger on back 18" diameter x 2-1/4" D