The HealthTree kids pulse ox accurately measures childs oxygen saturation, pulse rate, and perfusion index. Our children pusle oximeter features a text flicker alarm function. If the measured values exceed the set range, the text on the pulse oximeter screen will continuously flicker. If your child has small fingers, you can use big thumb or toes to measure. Our kids pulse oximeter can accurately measure data within 5 seconds. It has a one-button operation and automatically shuts off if left idle for 8 seconds. The fingertip pulse oximeter is made of ABS material, and the fingertip clip is made of soft and easy-to-use silicone material.