The forehead gun is battery powered, and the package includes 2 dry batteries. The thermometer can only be set in dual modes. It can switch freely between forehead temperature and ear temperature. It can also measure the temperature of the object and the indoor temperature. Our infrared measuring instrument is equipped with advanced German imported probe sensor and smart chip, which can get a more accurate temperature immediately within 1 second, so that it can be easily and conveniently diagnosed. The top probe sensor determines its higher accuracy, and the temperature measurement accuracy is as high as 0.2C. The non-contact design can detect the temperature within a distance of 1-5 cm (0.4-2 inches), which is more healthy and convenient. HD high-definition screen, display results are clear and easy to read, historical data can be tracked, 35 groups of memory data can be read. With its own warning function, with the help of a three-color backlit LCD display, the results can be read clearly and quickly even in the dark. (Green room temperature; orange slightly hot; red hot, if the temperature is too high, it will automatically alarm)