LED: digital screen display, display red, color screen display;USB: Connect U disk (maximum support 32GB,not included)VOL-: Short press is to select the previous song; long press is to decrease the volumePLAY/PAUSE: Short press is the switch between pause and play; short press in the FM FM state is automaticVOL+: Short press is to select the song; long press is to increase the volumeMODE: USB / TF / FM / AUX / BLUETOOTH tone switchingTF: Connect TF memory card (maximum support 32GB,not included)Infrared receiving moduleMaster IC: AC6926Bluetooth IC: AC6926 Bluetooth version is version 50Music format: MP3 / WMA / WAV / APE lossless formatRadio FM frequency: 875-1075 MHZSupport function introduction: support MP3 / USB / TF / LINE IN / FM / BLUETOOTH / remote remote connection / DC 5V or 12V (optional)About the structure: panel size: 68 * 23 MM, the two corners of the panel and the screw hole position, then the cover cover surface, the depth of the board is 32 MMColour: BlackMaterial: metal + plasticPackage Content: 1* Decoder1* remote control (without battery)3* cord setOnly the above package content, other products are not included.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.