... for car audio, common use SD Card/USB mp3 player with fm radio function DC 12V used for car audio, common use production ... DC 12V Power inputDC 12V 300 MA Power rating 1W Fm radio frequency range 88MHz-108MHzMode size 7.5*7.5*3 ... , pause, volume regulating, FM searchingWith earphone socket, can be connected to earphone or multimedia speaker directly SD Card/USB mp3 player with FM