The Index™ Sleep Monitor sleep band has a pulse oximeter feature to gauge the saturation of oxygen in your blood. Knowing your oxygen saturation can be valuable in understanding your overall health and help you determine how your body is adapting to altitude. Your sleep band gauges your blood oxygen level by shining light into the skin and checking how much light is absorbed. This is referred to as SpO₂.

On your Garmin Connect™ app, your pulse oximeter readings appear as an SpO₂ percentage. Here you can view additional details about your pulse oximeter readings, including trends over multiple days, as well as any variations in your oxygen saturation percentage (Breathing Variations). For more information on pulse oximeter accuracy, go to garmin.com/ataccuracy.