Williams AV PKT 2.0 EH Pocketalker 2.0 Personal AmplifierHear what you want to hear by amplifying the sounds and voices most important to you with a Pocketalker 2. 0 (PKT E1). Simply plug the included earphone or headphone into the headphone jack. Position the internal microphone near the preferred sound and adjust the volume and tone control until the sounds you want to hear are clear. The Pocketalker personal amplifier is used to amplify specific sounds or voices. It helps you hear what you want to hear