Distance Detection Technology - femometer family forehead thermometer built-in Distance Detection Technology, automatically measures body temperature within 1-3cm. If it is not within this distance range, the screen will keep sounding an alarm to remind you to make adjustments until it is adjusted to within 1-3cm. No more inaccurate temperature measurement due to uncertainty about the measuring distance. Ambient Temperature Compensation - Innovative algorithms, compared with other thermometers, femometer family baby thermometer can measure temperature normally in a lower temperature environment, as low as 41 . Giving you the most secure protection anytime and anywhere. Accurate & Fast - The femometer family No-Touch Forehead Thermometer with advanced infrared technology, through the arterial scan, for a quick & accurate 1 sec test, is ideal for all ages.