Overview: 2.8-inch ultra large LCD display Fahrenheit & celsius units selectable Range: -10'C ~ 50'C indoors, -50'C ~ 70'C outdoors, 20% RH ~ 99% RH for relative humidity Accuracy: /- 1'C Wall mounting holes available on the back Powered by 1 x AAA battery (included) Specifications: Dimensions: 4.33 in x 2.36 in x 0.51 in Weight: 3.63