Please note this adapter works with the listed Inogen Oxygen Concentrators only, it will NOT work with the external battery charger for Inogen Concentrators (see picture 2). Products trademarked iTEKIRO are marketed and sold exclusively by EPMUSA at Walmart.com. It is a DC CAR CHARGER, NOT AC ADAPTER. When attached to the 12V car cigarette lighter outlet, this auto adapter car charger powers your device and charges the battery in your vehicle. Features: This adapter comes with an elbow plug tip: The elbow places less stress on the connector and lasts longer, the right angle DC connector is better than straight tip to protect your device power jack and the adapter itself from damage Compact and lightweight LONG POWER CORD makes you reach more space with ease Protection from short circuit and over temperature Consuming less power and smart LED power indicators Specifications: Input: DC 12 - 24V Dimensions: 4.33" x 1.69" x 1.18" Weight: 9.7 oz Color: Black Please note this adapter is not original, it is a replacement made by iTEKIRO. Your purchase of this adapter comes with 100% satisfaction of 30-day money back guarantee and 1 year replacement warranty. We have been selling electronics power accessories since 2004. Your satisfaction is very important to us. If you have any questions or concerns, please email to us at any time, we will definitely respond to your inquiry in a timely fashion.