OEO Digital LCD Temperature Thermometer Humidity Meter Clock show Indoor & Outdoor temperature Large LCD display, multi-function, Powered by 1 x AA battery (not included) Indoor & outdoor temperature display, indoor humidity display and time display. Measures temperatures as low as -58 Fahrenheit and up to +158 Fahrenheit. If used outdoors, please place under protected area such as a covered porch. 12 hour / 24 hour displaying system selectable, / F unit selectable.