AudiSee
The AudiSee is a technological breakthrough in assistive listening devices. 
The AudiSee is a technological breakthrough in assistive listening devices. It provides students with a hearing loss the opportunity to access the entire message, by combining their remaining hearing capabilities with visual cues. Several studies have demonstrated that the combination of visual and audio cues is strongly correlated to message comprehension.
The AudiSee system is intended for oralist people with hearing loss i.e. people with a hearing loss that communicate through spoken language and who usually have a Cochlear implant or hearing aids. The teacher wears a headset with a miniature camera and a microphone. The image and voice of the teacher is then transmitted to a small monitor placed on the student's desk or to a standard TV set placed in front of the classroom.
For more information http://www.sforh.com/communication/audisee.html