These are a few links to information on communcation aids, please add on any information that you have found useful ..
CAC - Communication Aid Centre.nhs.uk
E Tran Frame or eye-gaze-communication-board is a tool used to identify interest & choice where verbal & mobile are limited -
Google image search -
Communication by Gaze Interaction - for more information -
Eye gaze technology is good
Defiinition of Communication aids from direct.gov.uk