Williams Sound PKT PRO1-3 Pocketalker PRO System Amplifier with Folding Headphone, 100 hours of battery life, Adjustable volume control internal tone control, Accommodates a variety of earphone and headphone options Pocketalker PRO 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...