Direct Audio Input (DAI)

The capability of connecting a sound source, such as a TV or CD or DVD player directly into a hearing aid. DAI bypasses the hearing aid’s microphone by plugging a cord connected to a sound source directly into the hearing aid. Most hearing aids do not have the necessary DAI connections (called boots or shoes) so you have to ask for this specifically if you want it. Sometimes used to refer to the connection of an FM auditory trainer directly into a hearing aid.