The DC Mobile Adapter allows you to charge your Z1 PowerShell from a standard automotive style DC adapter (cigarette lighter type adapter).
 
The DC Power Cord for Z1 / Z2 CPAP Machines is used to charge the Extended Life Battery Battery through the PowerShell with a 12 Volt battery source (cigarette lighter style plug) such as in a car. The peg end of the cord plugs into the PowerShell. The other end of the cord ends in a power/cigarette lighter outlet. This DC Power Cord can be used with a power outlet in a vehicle or a stand alone battery power source.
The cord length is 6 feet tip to tip but the cord only is approximately 5.5 feet.