solution, Bluetooth version 5.0 lossless playback, double decoding MP3, WMA, WAV, FLAC, APE lossless format music/read USB disk/read TF card/radio FM/external input LINE IN/infrared remote control/power off memory/power supply PREV/VOL-: to select the previous song. Long to lower the volume Play/Pause: Short to switch between pause and play; Long 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 song. Long to increase the volume; Compatible with MP3 / WMA/WAV/FLAC/APE Three buttons: PREV/PLAY/NEXT; 1, PREV (previous song/volume down) key: MP3 state, the previous short to the previous song, long to reduce the volume; 2, Play/Pause: MP3 state short to play/pause; 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 a song, long 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 first Audio accessories Category: audio accessories Music format: MP3/WMA/WAV/APE/FLAC lossless format FM Radio frequency: 87.5-107.5MHZ Support functions: Support MP3/USB/TF/LINE IN/FM/5.0 BLUETOOTH/ remote control Panel size: 5cm x 2.5cm; Board depth: 3.5cm Colour:As Shown Material:plastic+metal Specifications: 5V Package Contents: 2 x Bluetooth 5.0 decoder board 8 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.