The AN/PRC-63 is a compact lightweight battery powered transceiver issued to air crews and used as a survival radio. It was produced in 1965 by GTE-Sylvania for a Navy contract and was at that time, the smallest radio of its type ever produced. This radio also incorporated the first ever antenna known as the "rubber ducky". The PRC-63 was powered by a small 14 volt mercury battery. (Located in the Vietnam Display)