Required accessories for oxygen concentrator:-  Humidifier bottle  nasal cannula or oxygen mask power cord battery pack (if you use a portable oxygen concentrator) filters An oxygen concentrator box contains the following items : Home oxygen concentrator sales package contain following Items Oxygen concentrator machine Humidifier bottle Nasal cannula for oxygen concentrator (Note: if someone wants to use oxygen mask than he/she can buy extra) Oxygen Concentrator filter ' Nebulization Kit (if oxygen concentrator comes with In built nebulizer) user manual Portable oxygen concentrator contains the following items and accessories: Portable Oxygen Concentrator Single Battery Pack Carrying Case Power Supply (AC/DC Adapter) AC Power Cord DC Power Cord (Auto Adapter) Instructions for Use (user manual)