Main functions: 1. Decoding supports MP3, WMA, WAV, FLAC, APE lossless format music. Support radio FM, search frequency band (87.5MHZ-108.0MHZ) 2. LCD screen display, synchronous display of lyrics. Power-off memory function 3. Support Bluetooth call function, Bluetooth version 5.0. Support infrared remote control operation at a distance of 10 meters 4. Support recording function. Support external audio source input LINE IN 5. Support SD interface. Support USB interface (U disk) Buttons operation details: 1.REC: the REC button to start recording, the REC button again to cancel the recording function and play the recording file; when recording, it is necessary to connect a storage device, such as: U disk or TF card; 2.REPEAT: once to repeat the single song, again to cancel the single repeat, and play in order; 3.PREV button (previous song/fast rewind): In MP3 state, VOL-short is the previous song, and long is fast rewind; in FM state, short is to move up a station number; in Bluetooth