Just plug PowerJolt into your cigarette lighter or 12 volt power outlet to charge your player in your car while you use it. PowerJolt works with iPhone, iPod, and almost any other device that charges by a standard USB connection. When you arrive at your destination, unclip the Reserve battery pack and take it with you.The Reserve battery snaps into your Dock Connector, adding extra time on your iPod or iPhone. Now no more worrying about battery life, no need to lug your charger along with you. PowerJolt Reserve is the most USB charge you can pack into the smallest footprint.Features: Colour : Black. The industry"s most trusted 12 volt charger. Charges iPhone, iPod, MP3 player, other USB-chargeable devices. Removable backup battery provides hours of additional use for iPhone and iPod. Battery interchangeable with PowerBlock Reserve AC Charger. Compatible with Iphone 3G, 3GS, ipod Classic, ipod with video , ipod photo, ipod mini, ipod (click wheel).