The GCE Zen-O Lite DC power supply enhances the freedom and independence your portable oxygen concentrator provides you with. Whether you're in between errands, taking a road trip, or going on a date with your loved one, the DC power supply will allow your Zen-O Lite concentrator to supply you with oxygen while preserving your battery life for when it really matters. The DC power supply plugs into any 12v outlet or cigarette lighter in your vehicle, and you can use it in your car, truck, RV, or boat. Whenever your Zen-O Lite is plugged into the DC power supply, not only will your concentrator run off of your vehicle's battery, the battery you have installed in the concentrator will recharge on EVERY oxygen setting—it doesn't matter what setting you are using. The major advantage is that you can recharge your batteries virtually anywhere as long as your vehicle has a 12v outlet. We recommend plugging your concentrator into the DC power supply whenever you can to preserve your battery life for when it really matters. It's important to remember that because the DC power supply uses your vehicle's battery, it will take longer to fully recharge than the AC power supply.