WORLD SMALLEST Thermometer / Hygrometer Temperature Humidity Monitor High Precision, Latest Design & Super Convenient Brand Digoo Model TH1130 Thermometer / Hygrometer Size 57mm x 44mm x 15mm Display Temperature & Humidity (°C/°F) Working Way With a hole on the back for hanging With a support on the back for standing With a magnet inside the back for sticking Power DC 3V operated via one CR2032 battery Sensor High Precise from Professional Manufacturer Temperature Range : -50°C~ 70°C (58°F~185°F) Accuracy :10°C~40°C -- +/-1.5°C  If out of the range +/- 5°C Humidity Range : 10%~99% Accuracy : 40%~80% -- +/-5%, If out of the range +/-7% Main Feature : World smallest thermometer / hygrometer---Digoo TH1130, powered by DC 3.0V one CR2032 battery (Included). You can press the front button to switch between°C/°F display. The indoor temperature will adjust within 30seconds automatically after powering on. Comfort level indication : (With 3 Different Symbols Showing on The Screen.) Comfortable : Temperature between 18°C to 26°C, and the humidity between 40% to 60% Uncomfortable : Temperature lower than 10°C or higher than 30°C, and humidity lower than 30% or higher than 70% Normal Comfortable : Temperature between 10°C to 17.9°C or 26.1°C to 30°C, and the humidity between 30% to 39% or 61% to 70% Battery Installation : There is a battery included for you, if you need to replace it, please open the battery compartment cover, insert a new CR2032 battery according to the correct polarity showed in the compartment, and close the battery compartment cover. (Usually one battery can last a year :)   Package Includes : 1 x Digoo DG-TH1130 Thermometer Hygrometer (Black/White Option) 1 x Digoo Original CR2032 Battery 1 x Digoo English User Manual 1 x Digoo Original Color Gift Package