Plethysmograph Visual representation of your heartbeat. Consistent waveform represents good blood flow detected. Perfusion Index Numerical representation of your pulse strength. Higher number corresponds to stronger pulse strength. Multi-Directional Display Display can be rotated, offering 6 different layout options. Choose the layout that you can read conveniently or switch to another layout for your caregiver to read. Low Power Consumption Using two AAA batteries, the oximeter automatically powers off when not in use and delivers up to 20 continuous hours of battery life. Crystal Clear Display Read your oxygen saturation level and pulse rate results with remarkable clarity in portrait or landscape formats with rotation that detects your hand movement.