Uses advance infrared technology to measure human body temperature instantly and accurately at the forehead This non-contact thermometer can be mounted on a stand or the wall and will take temperature readings in one second from up to 10 cm away This commercial size thermometer is great for taking the temperature of staff, patients, daycare children, students, factory employees and more This non-contact thermometer is non-invasive and takes a temperature reading instantly If a fever is detected a red light is displayed along with 10 short beeps If no fever is detected a green light is displayed 1 second response Large bright screen Takes 1 x 3.7V 18650 rechargeable lithium battery (included) ?C / ?F Switchable Medical Device Class Class 2 Type Digital