This large well viewable Outdoor Clock shows Temperature as well as the Humidity. Excellent for Schools, Daycare felicities and anywhere Outdoors. Features: Eighteen Inch diameter Wall Clock by La Crosse Technology. Clock Features: Two Models to Choose From. Atomic time with manual setting Automatically sets to exact time Accurate to the second Automatically updates for daylight saving time (on/off option) 4 time zone settings Simple operation: insert 1 "AA" alkaline battery