The HealthTree fingertip pulse oximeter accurately measures oxygen saturation, pulse rate, and perfusion index. It features a text flicker alarm function. If the measured values exceed the set range, the text on the pulse oximeter screen will continuously flicker. It is ideal for sports activities, mountaineering, and individuals who need to monitor blood oxygen circulation and heart rate. Our 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 body of the device is made of ABS material, and the fingertip clip is made of soft and easy-to-use silicone material. The oximeter comes with a lanyard for easy portability.