Integrate blood oxygen probe and process display module into one. The product is small in size, light in weight and easy to carry, comfortable for kids also The product is easy to use and has low power consumption Blood oxygen saturation value display, pulse rate value, bar graph display, pulse waveform display, battery power indicator. Can change the display mode 4 directions change. Automatic shutdown function: In the state of the measurement interface, the measured finger is automatically turned off within 5s after being disconnected.