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厂家直供CD式消防广播主机KT9213/CD（前置放大器） 1,CD/MP3播放器2,USB接口可配接U盘、读卡器播放音乐3,CD和MP3播放自动或手动转换4,具有曲目显示屏5,自供稳压电源6,尺寸2UCD Player1,CD/MP3 player .2, USB interface can be equipped with U disk, card reader to play music.3,CD and MP3 player automaticallyormanually convert.4, Repertoire display screen.5, Self-regulated power supply