Signia CROS Invisible Hearing Aid Leave a Comment / Hearing Aids, Technology Do you have hearing loss in one ear?Missing out on the conversation due to background noise?Do you have difficulty following a conversation in a group?You don’t have to put up with it…Introducing Signia’s latest CROS invisible device is available at all Audi Hearing Clinics now: Improves your ability to follow speech by reducing background noise works for one-sided deafness.