Automatic fault detection function, 1L-6L flow rate for double oxygen inhalation, negative ion function for 6 million per cm3, 96-106kpa atmospheric pressure range, 51-150m³/h air volume, LED large screen display, voice for help function, on / off key, negative ion function key, + / - the timing function key, flow adjustment key, cooling air intel and handle, oxygen outlet, humidifier water tank, oxygen flow display.