This is the indoor monitor that measures and clearly displays the concentration of airborne impurities in a room. Ideal for allergy sufferers, those with respiratory issues, or anyone who wishes to maintain a healthy indoor environment, it detects the levels of dust, pollutants, and other particulates 2.5 microns or smaller, which are small enough to enter the respiratory system. The brightly colored LED screen shows numeric PM2.5 levels, along with a six-level indicator that lets you determine at a glance whether air quality may pose a potential health risk. Also displays indoor temperature and humidity. With 12/24 hour clock. AC adapter with 5 ft. cord. 5" H x 4" W. (4 oz.)