Patent ID: 7774030

Claim:
A hands-free device for use with a cellular telephone/two-way radio, the hands-free device comprising: a cable having a first section; a microphone coupled to the cable; a speaker coupled to the cable; a switch coupled to the cable; a second circuit board; an audio amplifier attached to the second circuit board and electrically coupled to the first section of the cable, wherein the audio amplifier is electrically coupled to the speaker; a first circuit board; a first transistor attached to the first circuit board and electrically coupled to the first section of the cable, wherein the first transistor is electrically coupled to the audio amplifier through the first section of the cable; a first case, wherein first transistor and the first circuit board are inside the first case, and wherein the second circuit board is outside the first case, and wherein the first section of the cable is substantially outside the first case; and means for electrically interfacing the switch with the cellular telephone/two-way radio, so the switch functions as a PTT button for half-duplex two-way radio communications, and as a send button for full-duplex telephone communications.