What is a T coil?
T coil, T-Switch or Telephone coil is small coil of wire within a hearing aid that is activated by a switch on the hearing aid. A T coil allows a hearing aid to pick up a phone signal directly. It also prevents feedback and cuts out surrounding noise when making a phone call. A telephone whose ear piece emits a magnetic field that can be easily picked up by a hearing aid T coil is called “hearing aid compatible.” The T coil can also be used to easily and conveniently enable a hearing aid to work with various other types of ALDs.
