This USB 2.0 cable connects your iPhone or iPod - directly or through a Dock to your computer's USB port for efficient syncing and charging or to the Apple USB Power Adapter for convenient charging from a wall outlet.
I didn't expect these to be any good in view of the price but they do exactly what they should... and arrived very quickly. I combine them with a 3 pin/USB adapter and can charge from the mains. Much cheaper than the Apple designated charger. Don't hesitate!