Did you know you can charge, while simultaneously operating your Lifestyle Rhythm P2-S4 oxygen machine on all settings in your vehicle? The only thing you need to accomplish such a feat is the Rhythm P2-S4 DC power supply. We highly recommend that you never leave the house without the DC power supply, as this will quickly become your travel companion. Thanks to the convenient Rhythm DC power supply, your day does not need to come to an end when the battery of your device starts to run low. You have the ability to easily plug the DC power supply into the standard cigarette lighter outlet in your vehicle. This feature not only recharges the battery, allowing for uninterrupted use, but it will also ensure the operation of your Rhythm P2-S4 remains seamless, no matter which setting or mode you are currently using. This essential accessory gives you the freedom to extend your outings and travel with confidence knowing your oxygen therapy remains uninterrupted.