This app link pulse oximeter produced by Biolight through Bluetooth, which display real time blood oxygen waveform, SpO2, PR, PI, etc, and their trend chart. Combined with oximeter, this software is for daily maintenance of people with blood vessels dieases or respiratory disease, and for seniors of over 60, people who often have extreme sports or work/live in oxygen-deficient environment. The data trend can be used for sleep state analysis.