This device is used to determine the pulse frequency of the heart rate and the level of arterial oxygen saturation (SpO2). It is user friendly and offers measurement that is pain free. It boasts a compact, lightweight design to use both on the move and at home. It can be used for high altitude sports such as skiing and mountaineering. It can record continuously for up to 24 hours. It comes equipped with a USB charger and USB cable. It offer four views on its XL color display. It has an alarm function that can be set individually.