Situating between 3 and 5 cm area will get the data from the temperature practically instant With a multiple function not only can measure the body temperature if not also the different surfaces like water bath, food, etc With an ergonomic design, this thermometer has CE and RoHs certification for marketing in the European market no contact, for safety and hygiene, designed to measure body temperature power supply (not incl.) 2 x 1.5V AAA