Direct manufacturer 8 lpm output oxygen flow even for emergency and heavy duty, compact structure with oxygen humidifying, high quality overload protector, pressure sensor and magnetic valve with ce, ul certificates Features: 1-dual oxygen output, offer average flow oxygen for two persons simultaneously, 2-optional function for nebulizer while inhaling oxygen treatment, sterilization, dust-removing, oil free and smell removing. 3-oxygen humidifying (strengthen safety level), lcd screen display, 4-super-low noise, energy saving, environmental protected, 5-automatic switch between plain and plateau areas. 6-best solution for high altitude anoxia. 7-suitable range: homecare, hospital, clinic, nursing house, outdoor For the crowd: Pregnant women, students, white-collar, the aged, bad sleeping, chest distress, lapse of memory, absent-minded, indigestion, high mental labor. Excellent function of health care, beauty-making and medical treatment, help promoting