Jerry solution, Bluetooth version 5.0 lossless playback, double decoding MP3, WMA, WAV, FLAC, APE lossless compatible withmat music/read USB disk/read TF card/radio FM/external sound source input LINE IN/infrared remote control/power off memory/power supplyPREV/VOL- : Press to select the previous song. Long press to lower the volumePlay/Pause: Short press to switch between pause and play; Long press is USB/TF/FM/AUX/BLUETOOTH sound switch, in the FM radio status, automatically search the short play pause key;NEXT/VOL+ : Tap to select the next song. Long press to increase the volume; Compatible with MP3 / WMA/WAV/FLAC/APEThree buttons: PREV/PLAY/NEXT; 1, PREV (previous song/volume down) key: MP3 state, the previous short press to the previous song, long press to reduce the volume; 2, Play/Pause: MP3 state short press to play/pause; Press and hold the test tone switch of USB/TF card /AUX/ Bluetooth mode. 3, NEXT (next song/volume increase) key: in the MP3 state, short press a song, long press to increase the volume; this model has the function of automatic conversion device. If no device is available, the default status is Bluetooth. If there is a device, explain it firstAudio accessories Category: audio accessoriesMusic compatible withmat: MP3/WMA/WAV/APE/FLAC lossless compatible withmatFM Radio frequency: 87.5-107.5MHZSupport functions: Support MP3/USB/TF/LINE IN/FM/5.0 BLUETOOTH/ remote controlPanel size: 5cm x 2.5cm; Board depth: 3.5cmColour:As ShownMaterial:plastic+metalSpecifications: 12V Package Contents:1 x Bluetooth 5.0 decoder board4 x cables Only the above package content, other products are not included.Note: Light reflection 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.