- Induction Hearing Loops - These devices broadcast through the telecoil (T-coil) in a hearing aid or cochlear implant. The hearing loop transmits sound from a PA system's microphone directly and wirelessly. Essentially, a hearing loop is like WiFi for hearing aids.
- One-to-one communicators - These devices allow a person to speak into a microphone that sends sound directly to one’s hearing aid. They are especially useful in noisy environments. The speaker also does not have to shout, and the conversation can remain private.
- Personal frequency modulation (FM) systems - These systems are like radio stations that operate on special frequencies. A receiver worn around the neck transmits sound to the hearing aid. The sound comes from a transmitter microphone used by a speaker, though in many public places, the transmitter is built into the general sound system.
- Infrared systems - This system is used with TV sets and uses infrared light waves to transmit sounds. The infrared system sends a signal to a receiver worn by the hearing impaired listener, who can adjust the volume. This allows other TV watchers to listen at a volume that is not too loud.
- Other examples include telephone amplifying devices and direct-audio-input, which allows people to plug their hearing aids directly into an electronic device, like an iPod.
- Bluetooth adaptors - These systems allow people with hearing loss to hear phone calls more easily, hear sound on T.V.s at a louder volume than others sitting in the same room, and amplify any device that uses Bluetooth technology.