It allows such things as a USB (wired) keyboard to be connected. for 30 pin connector.
iPad / iPOD Camera Connection Kit 2 in 1. Older Connection Type. bmay
Apple iPad / ipod camera connection kit , please read description
2 X Apple iPad iPod Camera Connection Kit MC531ZM/A SALEd PP 03
Genuine Apple iPad partial Camera Connection Kit - additional connector / charge
Apple iPad iPod Camera Connection Kit MC531ZM/A
Apple iPad Dock + Camera Connection Kit USB SD (MC360ZM/A, MC531ZM/A)
