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PTTPRO Push to Talk switches for Heil, Elecraft, TenTec, Kenwood, Yaesu, Icom, Alinco and other Amateuer Radio TransceiversPTTPRO Push to Talk Systems provide for transmitter, amplifier keying of Heil, Elecraft, TenTec, Kenwood, Yaesu, Icom, Alinco and other Amateuer Radio Transceivers and their respectecive boom, desk or studio microphone lines.