This is specially designed for children. There is a special mark to tell the children the best place to put their fingers. It can monitor a child's blood oxygen saturation (SpO2) value and pulse rate accurately through a finger even if the child is moving. It provides spot-check measurements of oxygen saturation of arterial hemoglobin. Display Type: Color OLED, 4-way directional read. Widely used in hospitals, schools, home healthcare, community medical centers and more.