The pulse oximeter is highly accurate to 1%. Can accurately detects SpO2, PR (Pulse Rate), and PI (Perfusion Index). The oximeter measurement results will displayed on the large led screen in 2-5 seconds. You could clearly view the measurement results. This handheld pulse oximeter with alarm sound, you could freely set the maximum and minimum values for SpO2 and pulse rate, and when your measurement is outside the range you have set, the pulse oximeter will sound an alarm. If you don't need the alarm sound, you can turn it off with one click. This blood oxygen monitor use of charging mode, not need replace batteries. Is very convenient. When fully charged, the oximeter can be used for 18 hours. The charging base and cables are included in accessories. Handheld Pulse Oximeter with bluetooth function,you could connect to your mobile phone. So the measurement data can be printed or shared your friends or family. The handheld pulse oximeter can store up to 10 IDs. You can use this fingertip pulse oximeter with your family.