Williams AV PKT D1-0 Pocketalker Ultra Personal Sound AmpliferPocketalker Ultra System amplifies sounds closest to the listener while reducing background noise. Ideal for one on one conversation, small group, and television listening, or conversing in the car. Use with or without hearing aids. Plug in your earpiece, position the microphone near the preferred sound, adjust the volume to your comfort and start listening. Compatible with all Williams Sound earphones headphones (sold separately). Features 200 hours