Telephone Amplifier System (430-0200) Features Faxback Doc. # 32055 The Radio Shack Electronic Telephone Amplifier System changes your existing phone into a speakerphone, giving you hands-free phone operation. This also lets other people in the room listen and talk to the person on the other line. The amplifier is easy to install and use. It has a privacy button that disables the amplifier's microphone. This lets you talk privately with others in the room without the other party hearing you. The amplifier fits easily on a desktop and requires only phone-line power to operate, in most cases. This amplifier has been tested and found to comply with all applicable UL standards. (CS 12/7/95)