Which type of battery for temperature gun electronics

Is the question "What type of battery does the thermometer gun electronics use"? According to the information of the thermometer gun electronic, the thermometer gun electronic with 7 alkaline batteries. The thermometer gun is designed to measure the human body's forehead temperature baseline, and is very simple and convenient to use. 1 second to accurately measure the temperature, no laser point, eliminating the potential harm to the eyes, no contact with human skin, to avoid cross-infection, a key to measure the temperature, to detect the influenza.