<p>USB: Connect to U disk (maximum support 32GB)</p> <p>TF: Connect to TF memory card (maximum support 32GB)</p> <p>AUX: Audio Input Interface</p> <p>VOL-: Short is the last song; Long is the volume reduction.</p> <p>PLAY\/PAUSE: Short is the switch between pause and playback; Long is the radio FM automatic station.</p> <p>VOL+: Short is to choose song; Long is to increase the volume.</p> <p>MODE: Switchover of USB\/TF\/FM\/LINE IN\/BLUETOOTH Voice</p> <p>Main control IC: AC5322B</p> <p>Bluetooth IC: AC5322B Bluetooth version is version 5.0</p> <p>Music format: MP3\/WMA\/WAV\/FLAC\/APE lossless format music</p> <p>Power: 2 * 3W, connected to two 3W speakers</p> <p>Radio FM Frequency: 87.5-107.5 MHZ</p> <p>Introduction of Support Functions: Support MP3\/USB\/TF\/LINE IN\/FM\/BLUETOOTH\/Remote Control\/DC 5V</p> <p>About structure: panel size: 107 * 25 MM, panel corner and screw hole position, then cover , the depth of the board is 32 MM</p> <p>Description of recording function</p> <p>1. the MODE button for a long time to start recording, and then the MODE button for a long time to cancel recording function.</p> <p>2. the PLAY\/PAUSE key to play the recording file.</p> <p>3. When recording, it is more necessary to connect a storage device, such as a U disk or a TF card.</p> <p>Colour: Black</p> <p>material: plastic</p> <p>Package Contents:</p> <p>1 * Bluetooth 5.0 DC 5V Amplifier Decoder Board</p> <p>4 * Cable</p> <p>Only the above package content, other products are not included.</p> <p>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.</p>