This is a quick and professional ultra modern body and surface non-contact infrared thermometer designed to measure human temperature ranging from 32.0° Celsius to 42.9° Celsius (90°Fahrenheit to 109.4° Fahrenheit) and temperature of objects. This device can measure temperature in both degrees Celcius and degrees Fahrenheit, long press mode (more than 5 seconds) to convert units from degree Celsius to degrees Fahrenheit. Measurement distance is 1cm to 15cm. This product uses a pair of size AAA 1.5V battery. All you have to do is to point to the Forehead and pull the trigger to measure human temperature or point the surface of an object and pull the trigger to measure its temperature. Enter mode menu to set device to 'body' to measure human temperature and set device to 'surface' to measure temperature of objects. This product has three different digital LCD screen colours for different ranges of human temperature