iVisualiser uses the iPads camera to grab images which you can then annotate and display on a large screen such as a whiteboard. If you have Apple TV or software such as AirServer then you can do this wirelessly. If not, then this will still work via a VGA cable.
Use it to give the children a close up view of objects such as flowers or seeds without crowding around a table. Show examples of children's work or documents such as exam papers.
Read more http://www.whiteboardblog.co.uk/2014/11/ivisualiser-lets-use-ipad-wireless-visualiser/