Hands free two way radio communication system with voice activated microphone. Model PRC-1 has 4.6 by 2.4 by 1.06 inches body pack transmitter/receiver with attached headset. PRC-2 has transmitter/ receiver integrated into headset. Transmits up to one quarter mile or more. Volume adjustable uses 9 volt DC or alkaline batteries. Weight 8. 92 ounces.