19"international standard machine case ; dimension:480*300*100;Wired / wireless FM receiving ,Microcomputer select platform, 16 programs memory ;CD/ cassette 、one pair of microphones signal are imported; it can mix speech and background music ; The signal source is monitored; The automatic / manual switch is chosen; Output frequency to adjust built-inly ( among 87~108 MHz, walk into 0.1 MHz), digital frequency formating type FM exports, FM output levels ≥110dB; 3V uneven type audio signal output.