The MedSense infrared non-contact thermometer provides users a convenient, non-invasive way of testing body temperature without physical contact. To use the device, place it at a safe distance of 3-5cm away from the skin and aim it at the middle of the forehead, with the help of the LED positioning light. Press the button to take the measurement and the thermometer will give an accurate temperature reading instantly. Requires two 1.5V AAA batteries (included).