Reliable Portable Oxygen On The Go The iGo Portable Oxygen System is a lightweight, three-liter oxygen concentrator that is capable of operating from three different power sources: AC Power, DC Power, or Rechargeable Battery. The DeVilbiss iGo has been put through aggressive durability testing to ensure consistent, reliable performance. The iGo is the perfect solution to keep pace with an active lifestyle. This small, portable oxygen system provides two modes of operation – continuous flow or PulseDose® delivery. The reliability and safety of PulseDose oxygen delivery has been proven effective in clinical testing as well as through independent tests performed by physicians and respiratory therapists.