I. Main Functions 1. Dual decoding supports MP3/WMA/WAV/FLAC/APE lossless format music; 2. Support Bluetooth-compatible function, Bluetooth-compatible 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 10 meters distance infrared remote control operation; 10. Support external audio source input LINE IN; 11. Support radio FM, search frequency band (87.5MHZ-108.0MHZ); 12. Buttons: four-button multi-directional control, VOL-/SCAN/VOL+/MODE; II. Key Operation 1. VOL-button (previous song/volume down): in MP3 state, VOL-short press is the previous song, long press is the volume decrease; in FM state, short press is to increase a station number; in Bluetooth-compatible under the function, a short press is the previous song on Bluetooth-compatible, and a long press is the volume down. 2. SCAN button (play/pause): in MP3 state, short press SCAN to play/pause; in FM state, short press to play/pause, short press to automatically close and save the station; short press to play in Bluetooth-compatible function /pause. 3. VOL+ button (next song/volume up): in MP3 state, short press VOL+ for the next song, long press to increase the volume; in FM state, short press to decrease a station number; in the Bluetooth-compatible function short press for the next bluetooth-compatible song, long press for volume down. 4. MODE button: switch between USB / TF / FM / audio input / Bluetooth-compatible function in turn. III. 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 recorded file; 2. When recording, it is necessary to connect a storage device, such as: U disk or TF card; includes: 1 * Decoder Board 1 * Remote Control (without battery) 3 * Cables