Features: 1. Description of recording function 1. Long press the MODE button to start recording, and long press the MODE button again to cancel the recording function and play the recorded file; 2. When recording, it is necessary to connect a storage device, such as U disk or TF card; Under the storage device, such as U disk or TF card, long press the PLAY/PAUSE button (play/pause) to enter the recording folder and play the recording file; 2. Button and interface function 1. PREV: Twist to the left to select the previous song; NEXT: Twist right to select the next song; 2. IR: infrared receiving module; 3, MIC: support call and recording functions; 4. USB interface: connect U disk (maximum support 32GB); 5. LED: digital screen display; 6. SD card slot: connect SD memory card (maximum support 32GB); 7. AUX interface: audio input interface; 8. Volume knob: control the volume; 9. REC: Press and hold the REC button to start recording, and press the REC button again to cancel the recording function and play the recorded file; when recording, you need to connect a storage device, such as a U disk or SD card; 10. REPEAT: Press the single loop function once, press it again to cancel the single loop, and play it in sequence; 11. FD-: The short key is to switch to the previous folder, and the long press is to rewind; 12. FD+: The Short key is to switch to the next folder, long press is fast forward; 13. PLAY/PAUSE: Short press is to switch between pause and play; long press is to radio FM automatic station; 14. MODE: Switch between USB / SD / FM / AUX / BLUETOOTH; Specifications: Bluetooth version 5.0 Power: 2*40W Bluetooth calling function recording function Music format: MP3/WMA/WAV/FLAC/APE lossless format music Radio FM frequency: 87.5—108 MHZ Folder switching function Support function introduction: support MP3 / USB / SD / LINE IN / FM / BLUETOOTH / remote control connection / DC 12V (voltage range 7V-25V, current not less than 2A) Package Includes: 1*MP3 Decoder Board