This brother max thermometer allows you to accurately check your childs ear or forehead temperature and will give an accurate reading in just 1 second for forehead ear temperature readings our 2 in 1 thermometer is accurate to 02 degrees in just 1 second unlike other thermometers theres no need for probe covers just wipe after each use suitable from birth its perfect for the whole family bpa and mercury free and as youd expect a certified medical device it comes with 1 x 3v cr2