15 buttons to control music play/pause, previous/next song switching, and volume adjustment. It can be connected to a computer via the MINI-USB port and used as a USB flash drive to download MP3 songs directly from the computer. The onboard SPI Flash can realize related functions, which is more cost-effective. With 3W external amplifier. SPI Flash and TF are used to store MP3 songs. You can choose one from the two. If both exist, the TF card will be played first.(Does not include TF card) This product can play MP3 songs, support TF card, support USB download, has the advantages of small size, light weight, simple operation, and can be connected to the human infrared sensing module. The product appearance and printed words may vary depending on the batch, but this does not affect use. Colour:As Shown Material:plastic Package Contents: 1set * Sound Module 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.