With a bright white, easy-to-read face, this thermometer displays the temperature in both Fahrenheit and Celsius, from -20 F to +120° F (-30 to 50° C) . When darkness falls, a solar-powered LED bulb illuminates the thermometer for 4 to 8 hours. See the temperature outside, day or night Measures a large temperature range Place in full sun Thermometer is 22-1/2" H; 46" H overall with stake 5-1/4 diameter at top Two rechargeable NiMH batteries included On/off switch under cap