1.LED: digital color display, showing red, 4 colors;2.IR: infrared receiving module;3.MODE: Switching of USB / TF / FM / AUX / BLUETOOTH;4.: short press is the switch between pause and play; short press auto search in the radio state;5.USB: Connect USB flash drive (maximum support 32GB)6.TF: Connect TF memory card (maximum support 32GB)7.AUX: audio input interface8.-: Short press is to select the previous song; long press is to decrease the volume9.+: Short press is to select the song; long press is to increase the volumeSpecifications:Colour: Blackmaterial: plasticMaster IC: 6926Bluetooth IC: 6926 Bluetooth version is 5.0 version compatible with 2.1 version, version 3.0Music : MP3 / WMA / WAV / FLAC / lossless music Radio FM frequency: 87.5-107.5 MHZSupport function introduction: support MP3/USB/TF/ IN/FM/BLUETOOTH/Remote Control/ DC 5V or 12V (optional)About the structure: panel size:92 * 41MM,the depth of the board is 21MMPackage contents:1 * Bluetooth MP3 decoder board1 * Remote control (Not Bring the Battery)Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.