Non-contact infrared measurement, while avoiding cross-infection. Measuring distance is 1-3cm. The forehead thermometer is suitable for all ages, adults, infants and the elderly. It not only supports forehead function, but also can measure indoor / object temperature. High-accuracy infrared measurement, intelligent algorithm, audible alert for over-temperature. It is ideal for the forehead readings, and have a very small error margin(0.1°F for body mode, and 1.0°F for ambient mode. Battery is not included.