This is a great device to have indoor in any home. It detects PM2.5 and PM10 particles. PM2.5 causes respiratory diseases (asthma,respiratory inflammation, jeopardizes lung functions and even promotes cancers. While PM10 causes coughing, wheezing, asthma attacks, bronchitis, high blood pressure, heart attack, strokes and premature death. The device has worked great and keeps my family informed of both PM2.5 and PM10. The LCD screen is easy to read, buttons responsive, and accuracy pretty great while testing with other devices. Overall, the device is informative and great to have if you care about your health.