PT-208: 136-150MHz/150-174MHz;PT-308: 400-420MHz/450-470MHz EPROM storage, can store 10 channels ... Frequency range: PT-208: 136-150MHz/150-174MHz;PT-308: 400-420MHz/450-470MHz EPROM storage, can store 10 channels ... .5-15V External power: 5.5-15V FM transceiver FD-308/278