It has an anodized aluminum case and a built-in microUSB or Lightning cable for both charging and syncing. Available in 3000mAh, 5000mAh, 7000mAh and 12000mAh capacities. The latter two models have a USB charging port.
Mophie has finally come up with a battery case for the iPhone 5. The Juice Pack Helium has a 1,500mAh battery, enough to recharge the phone back to 80% without adding a lot of bulk.