IS-400-4CELL (with Single Battery), IS-400-8CELL (with Double Battery)
Inogen One G4 is a portable oxygen concentrator that offers oxygen therapy for patients that require supplemental oxygen. The G4 is the latest addition to the lightweight, portable oxygen concentrator market. Weighing less than 3 pounds, the G4 offers pulse flow oxygen in a range of 1 to 3 settings.
Philips Respironics -
1020015 (EverFlo Q Concentrator), 1020014 (EverFlo Q Concentrator with OPI Upgrade Available in Shopping Cart)
The ultra quiet EverFlo Q includes all of the great features of the original EverFlo Oxygen Concentrator in a quieter model. At just 43 decibels typical EverFlo Q is one of the quietest concentrators on the market. Its small form factor, advanced motor, low power usage, and lightweight, durable construction make it easy, convenient, and very popular!