solution, Bluetooth version 5.0 lossless playback, double decoding MP3, WMA, WAV, FLAC, APE lossless format music or read USB disk or read TF card or radio FM or external input LINE IN or infrared remote control or power off memory or power supply PREV or VOL- : Press to select the previous song. Long press to lower the volume Play or Pause: Short press to switch between pause and play Long press is USB or TF or FM or AUX or BLUETOOTH sound switch, in the FM radio status, automatically search the short play pause key NEXT or VOLand : Tap to select song. Long press to increase the volume Compatible with MP3 or WMA or WAV or FLAC or APE Three buttons: PREV or PLAY or NEXT 1, PREV (previous song or volume down) key: MP3 state, the previous short press to the previous song, long press to reduce the volume 2, Play or Pause: MP3 state short press to play or pause Press and hold the test tone switch of USB or TF card or AUX or Bluetooth mode. 3, NEXT (next song or 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 first Audio accessories Category: audio accessories Music format: MP3 or WMA or WAV or APE or FLAC lossless format FM Radio frequency: 87.5-107.5MHZ Support functions: Support MP3 or USB or TF or LINE IN or FM or 5.0 BLUETOOTH or remote control Panel size: 5cm x 2.5cm Board depth: 3.5cm Colour: Material:plasticandmetal Specifications: 5V Package Contents: 1 x Bluetooth 5.0 decoder board 4 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.