Usage Tips:Model: JQ-D008BT. Main control IC: AC 6921. Bluetooth IC: AC 6921 Bluetooth version is 5.0 Music format: MP3/WMA/WAV/FLAC/APE lossless format Bluetooth calling function. recording function. Folder switching function. Radio FM frequency: 87.5-107.5 MHZ Support function introduction: support MP3 / USB / TF / LINE IN / FM / BLUETOOTH / remote control connection / DC 12V About the structure: Panel size: length 112 x width 62MM, the panel is surrounded by screw holes, the depth of the panel is 22MM Button and interface function 1. PREV: Twist to the left to select the previous song;NEXT: Twist right to select song; 2. IR: infrared receiving module; 3, MIC: support call and recording functions; 4. USB interface: connect U disk (maximum support 32GB); 5. LCD screen: synchronous display of lyrics; 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: and hold the REC button to start recording, 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 TF card; 10. REPEAT: the single loop function once, it again to cancel the single loop, and in sequence; 11. FD-: The short key is to switch to the previous folder, and the long is to rewind; 12. FD+: Short key is to switch to folder, long is fast forward; 13. PLAY/PAUSE: Short is to switch between pause and play; long is to radio FM automatic station; 14. MODE: Switch between USB / TF / FM / AUX / BLUETOOTH; Colour:black Material:Plastic + Electronic Components Package Contents: 1 x decoder board 1 x remote control(2 AAA batteries not included) 1 set x cables Only the above package content, other products are not included. Note: Light reflection and different displays