Keep track of time while you're enjoying your outdoor living space with this 18-inch atomic clock. The large size makes it easy to tell time even from a distance, and the plastic frame is designed to withstand the elements for durable use. An integrated thermometer and hygrometer track temperature and humidity, making this clock a useful tool for your gardening efforts.Analog Thermometer (F/C) Analog Hygrometer (%RH) 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 (ET, CT, MT, PT)Power Requirements: 1 AA Alkaline Battery (Not Included) or, Optional: Add 2 additional AA's to extend battery life (up to 3 yrs)Temperature Range: -10 F to +130 F (-30 C to +60 C)Humidity Range: 1% to 99% (%RH)Numbers: 1.35 inches tallDial: 13.75" diameter; Clock weighs: 4.65 LBS