The forehead gun is battery powered, and the package includes 2 dry batteries. [Accurate and fast measurement] Our infrared measuring instrument is equipped with an advanced German imported probe sensor and smart chip, which can immediately obtain a more accurate temperature 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. [Non-contact design] Non-contact infrared forehead measuring instrument can detect temperature within a distance of 1-5 cm (0.4-2 inches), which is more healthy and convenient. You don't have to worry about disturbing the sleeping baby, it can effectively prevent cross-infection among multiple people. [LCD screen and fever alarm] The results displayed on the LCD screen are clear and easy to read. Measuring temperature with this baby thermometer is as easy as pointing and pressing a button. It has a fever alarm. It can provide up to 32 previous readings, which can more conveniently help you track changes in body temperature and monitor the health of family members. [Applicable to all ages] The digital infrared measuring instrument is suitable for all ages, including babies, children, adults and the elderly, and can be used in offices, restaurants, schools, companies, homes, etc. [Easy to use] Using the temperature gun is very simple. Press the button to turn it on, and it will automatically turn off after 10 seconds. There is no need for complicated buttons, only one key is needed to measure temperature, and it can automatically store 32 sets of historical data. With the help of a three-color backlit LCD display, even in the dark (green room temperature; orange slightly hot; red hot), you can read the results clearly and quickly.