Wireless Module MP3 Decoding Board DIY Car Audio Amplifier Motherboard with FM Receiver Microphone U Disk AUX SocketProduct IntroductionShell size: Length 75 * Width 50MM; Depth: 23MM Function description: Supports Bluetooth function (Bluetooth version 5.0)/microphone interface/recording function/dual decoding MP3, WMA, WAV, FLAC, APE lossless format music/read USB drive/read TF card/FM receiver/external audio input LINEIN/infrared remote control/power-off memory/12V power supply;Button usage instructions:Short press to start the next song; Long press to increase volume; Double click for next folderShort press once to pause and play in USB/CARD/BT/AUX/FM mode; In the receiving state, long press to automatically receive and coexist with the station. After receiving, the station will automatically play the first frequency point of the stored station;Short press to start the previous song; Long press to decrease volume; Double click to create the previous folder;Short press once: In USB/card mode, to switch playback loop mode, browse playback/RDO random playback/ALL all songs loop;Short press once to switch EQ mode: Normal, Pop, Rock, Jazz, Classical, Country;Short press once: Function conversion: Bluetooth - CARD-USB - Radio - Audio input; After plugging in USB/CARD, in the BT/FM/MIC microphone mode, long press the MODE button to play the recording to USB/CARD: