Features 1. Prince-100A fingertip pulse oximeter is suitable for both clinic and family use. 2. Tiny and light, it is very convenient to carry and use. 3. The pulse oximeter comes with a large LCD display. 4. The one key control allows easy measurement of oxygen saturation(SpO2), pulse rate(PR). 5. The fingertip pulse oximeter will automatically power off in 8 seconds after finger is removed from it. 6. The two AAA alkaline batteries with low voltage indicator allows 100 hours use.