The Meteor iPad Kit
is a B&H Kit
featuring a USB microphone from Samson
that allows the user to record directly into GarageBand running on an iPad (app not included).
The microphone is connected to the iPad via its USB cable using the USB adapter provided in the connection kit. The SD card reader does not have a function here, but is a useful addition to have for other purposes (like downloading photos from a digital camera's SD card).