1. main function: 1. Double decoding supports music in MP3/WMA/WAV/FLAC/APE lossless format; 2. Support Bluetooth function, Bluetooth version 5.0; 3. Support recording function; 4. The power amplifier is 2*25W, and 2 25W speakers can be connected at the same time; 5. 12V power supply (voltage range 7V-18V); 6. Color screen digital screen display; 7. Support USB interface (U disk); 8. Power-off memory function; 9. Support infrared remote control operation at a distance of 10 meters; 10. Support external audio source input LINE IN; 11. Support FM radio and cable frequency band (87.5MHZ-108.0MHZ); 12. Buttons: Four-button multi-directional control, VOL-/ SCAN / VOL+ / MODE 2. Key operation details: 1. VOL- button (previous song/volume down): in MP3 state, short press VOL- to last song, long press to decrease volume; in FM state, short press to increase a station number; in Bluetooth Under function, short press is the previous Bluetooth song, long press is the volume decrease. 2. SCAN button (play/pause): short press SCAN in MP3 state to play/pause; short press in FM state to play/pause, short press to automatically close and save the station; short press in Bluetooth function to play /pause. 3. VOL+ button (next song/volume increase): in MP3 state, short press VOL+ for the next song, long press to increase the volume; in FM state, short press to adjust the station number down; in the Bluetooth function Short press for the next Bluetooth song, long press to decrease the volume. 4. MODE button: Switch between USB / TF / FM / audio input / Bluetooth function in turn. 3. Description of recording function: 1. Long press the MODE button to start recording, long press the MODE button again to cancel the recording and play the recording file; 2. It is more necessary to connect a storage device when recording, for example: U disk or TF card