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What is a Telecoil (T-Coil)?

Tri-State Loops / What is a Telecoil (T-Coil)?

Telecoil IlustrationA tele-coil is a small copper coil that is an option in most hearing aids and is built into cochlear implant processors. Tele-coils, also known as t-coils, were originally used to boost the magnetic signals from the telephone handset. The telecoil is activated by a T or MT switch or program button. All landline and some cell phones are designed by law to be used with a telecoil. When using a tele-coil with a loop system, the tele-coil in the hearing aid functions as a wireless antenna that links to the sound system and delivers customized sound directly to the listeners aids.

The telecoil can make a noticeable difference in your life when combined with hearing assistive technology such as the hearing loop. This pairing of technology bridges the space between you and the sound source. The hearing loop connects the listener directly to the sound source while most of the background noise is eliminated.

If you are buying a hearing aid for the first time, be sure to ask that a tele-coil be included. With a telecoil you can expand the functionality of your hearing aid or cochlear implant.


Universal symbol for loop system

The Universal symbol for a loop system is as shown here. The “T” in the bottom Right corner lets you know that the room you about to enter is compatible with a tele-coil.

Loops are available in a variety of sizes and configurations. Induction loops are available for small applications including listening to a TV in a private residence or small group area, a pharmacy window or drive up bank window. They can also be designed and installed to accommodate large public facilities, like an airport, auditorium, board room, reception desk or place of worship. Induction loop systems can be designed and installed in most public buildings and facilities… small or large.

The Hearing Loss Association of America (HLAA) and the American Academy of Audiology (AAA) recommend audio frequency induction hearing loops as the preferred assistive listening system

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