High Quality NEW!!! Dimensions: 25 x 25 x 25 cm Weight: 471.74 g Anti Asthma Easy to use Serves to form the active breathing air & CO2 mixture, which has less oxygen but more carbon dioxide (this can be regulated). Breathing through the device for 20 minutes per day for 2-6 months, decreases breathing rate &, as a result, increases CO2 in the blood to the best possible level 6-6.5%