Anti-movement, good low-perfusion performance. Pop-up menu to setup alarm limits Small in volumeã??light in weight and convenient in carrying Operation of the product is simple , low power consumption SpO2 value display Pulse rate value display, bar graph display Pulse waveform display The display mode can be changed A pulse rate sound indication With measured data overruns limits and low-voltage alarm function Battery voltage indication Automatically power off function Display format and alarm limits can be saved after power off.