Indoor Relative Humidity & Comfort Level Indicator Clock Display With Alarm Function Selectable Celsius Or Fahrenheit Display Temperature Range: -50 - 70c (58 - 158 F) Temperature Accuracy: + and - 1 C (2 F) Humidity Accuracy: + and - 5% Humidity Display Resolution: 1% 10-second Sampling Period Includes 1aaa Battery & One 1.5v Battery Dim: 4.13'' H X 3.94'' W X 0.91'' D Weight: 4.48oz