This DC power cord is meant for use with the Respironics System One 60 Series models only. The Respironics DC Power Cord is perfect for frequent travelers, campers, and long-distance truck drivers. This cord can be used to operate Respironics CPAP and BiPAP Systems where AC power is not available. It plugs into a standard cigarette lighter socket found in automotive vehicles. This cord contains alligator clips for use with a deep cycle marine battery. This is a bundle.