I have a Model 259 ALC Annunciator which is an audible ALC indicator primarily used for the visually impaired. It can be used with any TenTec transceivers which have ALC ... or any transceiver that uses a positive going ALC voltage (from 1 to 7 volts). Never used, in original box with all mounting hardware, cables, etc. $15 post paid in USA Dennis, K7FL Battle Ground, WA.