NoiZfree Telecoil Induction Earhook $39.99 Description: Simply switch aid to "T" or "MT" Place light weight discreet earhook over ear The sound comes in crystal clear quality through the hearing aid Available in mono or binaural, 2.5 mm jack (cell phones) or 3.5 mm jack (audio devices-CD players, MP3 players etc.) Unique NoiZfree "HR" has an induction earhook on one side and an earbud on the other for patients who have one hearing aid and one one good ear