integrated with spo2 probe and processing display module. small in volume、light in weight and convenient in carrying. operation of the product is simple ,low power consumption. spo2 , pr and ridisplay,. pulse rate value display, bar graph display. low-voltage indication: low-voltage indicator appears before working abnormally which is due to low-voltage. automatically power off function: when the device is under the state of measuring interface . it will automatically power off within 5 seconds if the finger falls out of probe. v...