Non-contactTo prevents cross infection, the non-contact infrared forehead thermometer measures within 2 inch distance. LCD DisplayLarge LCD display including color change as temperature gets higher. Light display so you can see the temperature accurately even in the dark. Intelligent Temperature Alarm: The fever thermometer has a three-color backlight color alarm function. If the temperature is within the normal range 86 F to 99.3 F / 32-37.4 C, the LCD will display Green. If the temperature is 99.5 to 100.2 / 37.5 to 37.9, the LCD will display Orange . And the LCD will display Red when the temperature is 100.4 to 109.4 / 38.0 to 43.0, indicating that you may have high fever. High AccuracyProvides a precise non-contact measurement to give you an accurate reading within one second for a more efficient and convenient use . Choose between reading temperatures in C or F, and the Forehead Thermometer is accurate to 0.1C or 0.1F. Easy to useKeep the distance between the thermometer and the forehead is approximately 1-2and press the trigger to measure the forehead temperature. When you hear one beep sound, the LCD will show the result.