<p>VOL-: Short is to select the previous song; long is to decrease the volume</p> <p>PLAY\/PAUSE: Short is to switch between pause and play; long is to switch between USB \/ TF \/ FM \/ LINE IN\/BLUETOOTH, short is to automatically search channels in the radio FM state</p> <p>VOL+: Short is to select song; long is to increase the volume</p> <p>With Bluetooth call function, the power supply voltage is 5V, and the current requirement is above 2A</p> <p>Music format: MP3 \/ WMA \/ WAV \/ FLAC \/ APE lossless format music</p> <p>ON\/OFF: power switch</p> <p>DC 5V: charging interface</p> <p>Switch indicator</p> <p>Microphone: call function</p> <p>USB: Connect U disk (maximum support 32GB)</p> <p>TF: Connect TF memory card (maximum support 32GB)</p> <p>Main control IC: AC6826A</p> <p>Bluetooth IC: AC6826A Bluetooth 5.0</p> <p>Power: 2*3W, connect 2 3W speakers</p> <p>Radio FM frequency: 87.5-107.5 MHZ</p> <p>Support function introduction: support MP3 \/ USB \/ TF \/ LINE IN \/ FM \/ BLUETOOTH \/ DC 5V</p> <p>Colour: Black</p> <p>Material: ABS</p> <p>Package Contents:</p> <p>1 x MP3 decoder</p> <p>1 x 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>