The iPhone 1 (original iPhone) uses a 30-pin Dock Connector for charging. This charger cable connects a 30-pin Dock Connector on the phone side to a USB-A on the power adapter or computer side. The power adapter for the iPhone 1 is typically a 5W or 12W USB power adaptor. So, the original iPhone charges with a 30-pin Dock Connector to USB-A cable and a 5W or 12W USB power adapter.