To sync or charge, plug one end into your iPhone or iPod, and the other end into any USB port on your PC or laptop. Or, combine this cable with one of our wall chargers, car chargers, or combo chargers for a complete portable charging solution. A heavy-duty 40-inch cable runs through one of our durable, road-tested retractors, and includes a tough connector on each end. Grab each connector and pull to extend, give another quick tug and the cable rolls back into the retractor. Features & Specs, No tangled cords, Durable ZipKord Retractor, Cable Extends to 40", Sync and Charge with PC or Laptop, Compatible with all ZipKord USB Charger