Tested with other oximeter, values are OK (aproofed by FDA)
Vibration and Sound test for high or low value of oxygen (only low) and puls, OK.
Great battery time. Work to gether with smart phone. High price but unique functionality.
This little monitor does the trick. It is not that intrusive so it doesn't get in the way of my arm moving at night, but the sensor also stays put (been using it for about a week now and haven't had it come off). The software for the smartphone calculates numbers like the amount of time the saturation is >95 and the number of drops 4% or greater during the measured period. With the software for the computer, you can save this in report AND data exports to allow you to analyze to your heart's content.