Telecoil

My hearing aids support a telecoil (t-coil) input system. Telecoil is a simple induction coil that can create electrical current from magnetic field. The telecoil pick up electromagnetic signals emanated from an induction device and output them as sounds. So you can hear sound via telecoil instead of ordinary microphones.

I had thought that the telecoil was only compatible with some "hearing aid compatible" telephones. But there are a variety of induction devices that can put out magnetic signals to the telecoil.

I got two types of induction devices, a neckloop (left) and behind-the-ear wires (right). These devices can be plugged into an earphone jack of listening systems, including iPod. That is so great to me.