Philips Everflow Oxygen ConcentratorDescription:Everflo oxygen concentrator is a unique model that is stationary concentrator (Oxygen making machine for home). It delivers the features home care providers and patients deserve. It reduces operating costs with a design that is1. 5Littres and 10 Littres Available 2. It is Smaller and sleeker, dimensions 58 cm x 38 cm x 24 cm.3. It is Easy to store and transport.4. It has low maintenance.5. Sound is very less .6. Simpler for patients to use and maintain.