This talking clinical thermometer makes temperature-taking fun and easy for kids and adults. It's also an indespensible tool for the blind or visually impaired individual; especially if you have children of your own; or care for kids on a regular basis. This model's two-button design makes it extremely easy to use. Simply press the left button to turn the unit on; wait for the confirming beeps; then press the right button to begin taking your temperature. In about thirty seconds; you'll hear four beeps; followed by your body temperature announced in a very clear; female voice. The temperature will then be repeated once more; and the unit will automatically shut off after eight minutes; if you forget to turn it off yourself; that is. The thermometer is intended for oral or underarm use; and announces and displays your temperature in Fahrenheit or Celcius (depending on the model you choose). Yes; the unit is FDA-approved for the United States; and CE-certified for Europe. (Runs on two AG12 button-cell batteries; included.) Measurement: You can choose whether you're more comfortable with hearing your temperature announced in Fahrenheit or Celcius. Thus; please select the model of thermometer you wish to receive. Fahrenheit: Speaks and displays your temperature in degrees Fahrenheit - typically preferred by our American customers. This is also known as the Imperial System of Measurement. Celcius: Speaks and displays your temperature in degrees Celcius - which is preferred by our Canadian and European customers. This is also known as the Metric System of Measure.