✔ Oxygen anion: When oxygen is concentrated, our products can release negative ions, help the lungs to breathe faster and absorb more oxygen. ✔ Low noise&remote control for elderly: Noise reduction to keep sleep, low noise operation, the elderly sleep more comfortable. ✔ Quiet during sleep; Clear high-definition liquid crystal display, easy to read, infrared remote control within 20 meters. Power-saving mode: minimize electricity charges. ✔ Easy to Carr: It works with a car adapter when you out for a trip in vehicle, take it outdoor for a walking with its removable, chargeable li-ion battery. ✔ Suitable for home oxygen supply, health care function, improve the body oxygen supply system, supplement oxygen, improve health.