Fingertip Pulse Oximeter Features 1. Continuous operation for 20 hours with low power consumption. 2. Low battery indicator. 3. Low-voltage indicator light automatically shuts down in 8s when signal is out. 4. Small and light, easy to carry Key function description: In standby mode, press the key to start the working state, press this button lightly to change the display mode under working status. The outline picture of the product is for reference only, which is subject to physical objects.