Play MP3 AND MP4, with FM Radio function,build-in speaker 1 Playback I-pod,MP3 function, with audio input jack. build-in speaker2 FM Radio function, FM frequency rang: 87.5-108.5MHz.3 RESET and SCAN function4 adjust the volumn5 Use 4 *1.5V AA alkaline battery.6 External DC power port FM radio with built-in speaker