This product is a non-contact infrared forehead thermometer that professionally measures the temperature of the forehead of the human body. It is designed for all ages, adults, infants and elders. For best accuracy, the distance between the forehead thermometer and object of measurement should approximately be 1.96- 5.9 inches. Upgraded Sensor and System Advanced sensor and processing system deliver more reliable results, faster and safer. 0.5 second fast measurement with instant reading. In mute mode, you can take the temperature without waking your kids up. You can read it clearly even in the dark with a large backlit LCD screen. Product instructionsAfter powering on, it directly displays (Body temp) human body temperature (), not Fahrenheit.press and hold the MODE key for 8 seconds to switch between and .Press the light button will switch Body temp and HOLD mode.Package Included:1 x Non-Contact Infrared Thermometer( batteries not included)1 x User Manual1 x Screwdriver1 x Velvet bag2 x Screws