This Williams Sound® Pocketalker® kit offers a superb quality amplification system for listening to individual conversations, TV and radio, concerts and more. Volume and tone control can be adjusted. Comes with clip for attaching the microphone to a TV or radio, and a 12 foot extension cord to extend the microphone cord. Comes with headphones & earphone. Requires 2 AAA batteries. Measures 3.4 x 2.2 x .9 inches.