【Advanced Technology】 Precise oxygen concentration control, up to 29 +/- 2%, sufficient oxygen supply. Moderate airflow and good effect 【Function】Using this O2 generator, you will feel relaxed and comfortable, and it has sedative, analgesic, antitussive, itching, diuretic, appetite reducing, and blood pressure lowering effects. Take care of your exquisite sleep. 【Application】 Equipped with a rechargeable battery, it can be used at home, in the car, or even outdoors without power, and comes with complete accessories. 【Features】Convenient design, selected materials, compact and convenient, simplified headphone shape oxygen, suitable for indoor and outdoor use. 【Easy to Use】 Simple control, compact design, 1 button control, easy to operate.