Dual decoding supports MP3/WMA/WAV/FLAC/APE lossless format music. Support Bluetooth function, Bluetooth version 5.0, support infrared remote control operation 10 meters away. Support color screen digital screen display. With power-off memory function. Supports cards such as MMC/Memory/MMA and supports USB interface (U disk). Support external audio input LINE IN; Support FM radio, receive frequency band (87.5MHZ-108.0MHZ). Detailed operation of the keys 1. VOL (previous song/volume down) button: In MP3 mode, short press VOL button to go to the previous song and long press to decrease the volume; In FM mode, short press to increase the station number; in Bluetooth Under function, short press to play the previous Bluetooth song and long press to decrease the volume. 2. SCAN (play/pause) button: In MP3 mode, short press SCAN to play/pause; In FM mode, short press to play/pause; short press to automatically close and save stations; short press to play in Bluetooth/pause function. 3. VOL+ button (next song/volume up): In MP3 mode, short press VOL+ to move to the next song, and long press to increase the volume; In FM mode, short press to adjust the channel number down; Bluetooth enabled Short press to play the next Bluetooth song and long press to increase the volume. 4. MODE button: Switch between USB/TF/FM/audio input/Bluetooth function in sequence.