Professional Accuracy??Measures and display temperature and humidity??</br>With a magnet on the back(Wall mountable)</br>??/?? display conversion(hold on the button on the back for 3 seconds)</br>The package is the instructions??Open it??</br>Powered by one CR2032</br></br>Product Description</br></br>Measures and display temperature and humidity Mini body design</br><br/>http://www.amazon.com/gp/product/B01I7P687I