This 18-inch 12-volt adapter connects to your SoundWorks or PCWorks system, even right in the carrybag. Connect them to any cigarette lighter plug, or the optional rechargeable battery, so your music can go anywhere. Plug it into your car or boat cigarette lighter. And don't forget to check out the CarryBag (sold separately). It makes transport of SoundWorks and PCWorks a breeze. You can even play music while the speakers are still inside the bag!