2021 Model NEW Inogen G3 Portable Oxygen Concentrator Intelligent Oxygen Delivery - 24/7 Daytime and Nighttime Oxygen Delivery Rechargeable Lithium-Ion Battery - Varies *You Choose Single or Double Life Battery OR Choose From Additional Bundled Freedom Packages!* Custom Carrying Bag with Shoulder Strap. Auto Breath Detected Oxygen Delivery A/C Wall Power Supply- Charges battery while using your Inogen USA and International Power - Can be used on 110V or 240V. Converts proper voltage. D/C Car Power Supply- Charges battery while using your Inogen Easy-to-Read LCD Control Panel - Built-In Oxygen Purity Monitor Nasal Cannula (Soft-Tip)