Lowest Price on eBay! New Open Box, fully tested and guaranteed to charge your Inogen One G4 or Oxygo Fit batteries. Not only do you get a great deal on this unit, but Shipping is Free and on top of that 1 Business Day processing! With POB Batteries, you are always guaranteed to get 100% authentic products, never any "knock offs" like other sellers on eBay. We do accept refunds and or exchanges and have excellent customer service. Please review what our customers say about our products and service! Sorry No International Shipping even with US Global mailing address