Oxygen absorption function: By oxygen absorption, it can effectively improve the bodys hypoxia condition and achieve the purpose of oxygen supplement health care. Lt is suitable for the elderly, women and the infirm, and students with different degrees of hypoxia. It can also be to eliminate fatigue and quickly restore body function after physical or mental strenuous exercise. This product is a high quality molecular sieve that absorbs oxygen(PSA extracts oxygen directly from the air). The oxygen machine is small in size, light in weight, low in power, low in noise, and simple in operation.