Telecoil

A small copper coil inside a hearing aid or cochlear implant processor that picks up magnetic signals and converts them to sound. Telecoils allow hearing device users to receive audio directly from telephones, loop systems, and other compatible devices while reducing background noise. In telephone use, the telecoil picks up the magnetic signal from the telephone receiver rather than acoustic sound, improving clarity. About 64% of hearing device wearers have telecoils, though only one-third commonly use them for telecommunications.