Main control IC: AC 6921; Bluetooth IC: AC 6921 Bluetooth version is 5.0<br> Music format: MP3/WMA/WAV/FLAC/APE lossless format<br> Bluetooth calling function; recording function; Folder switching function<br> Radio FM frequency: 87.5-107.5 MHZ<br> Support function introduction: support MP3 / USB / TF / LINE IN / FM / BLUETOOTH / remote control connection / DC 12V<br> Button and interface function<br> 1. PREV: Twist to the left to select the previous song; NEXT: Twist right to select song;<br> 2. IR: infrared receiving module;<br> 3, MIC: support call and recording functions;<br> 4. USB interface: connect U disk (maximum support 32GB);<br> 5. LCD screen: synchronous display of ;<br> 6. SD card slot: connect SD memory card (maximum support 32GB);<br> 7. AUX interface: audio input interface;<br> 8. Volume knob: control the volume;<br> 9. REC: Press and hold the REC button to start recording, press 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;<br> 10. REPEAT: Press the single loop function once, press it again to cancel the single loop, and in sequence;<br> 11. -: The short key is to switch to the previous folder, and the long press is to rewind;<br> 12. +: Short key is to switch to folder, long press is fast forward;<br> 13. PLAY/PAUSE: Short press is to switch between pause and play; long press is to radio FM automatic station;<br> 14. MODE: Switch between USB / TF / FM / AUX / BLUETOOTH;<br> Material: plastic<br> colour: black<br> Package Contents:<br> 1 x decoder board<br> 1 x remote control<br> 4 x lines<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.<br> Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-DIMEANI official store