15 buttons to control music play/pause, previous/next song switching, and volume adjustment. Can be connected to a computer via MINI-USB port and used as a USB flash drive to download MP3 songs directly from the computer. Equipped with onboard SPI Flash for cost-effective functionality. Features a 3W external amplifier. Supports both SPI Flash and TF card for MP3 song storage; if both are present, the TF card will be played first. (TF card not included) Plays MP3 files, supports TF card, supports USB download, compact size, lightweight, simple operation, and compatible with human infrared sensing module. Product appearance and printed text may vary by batch, but this does not affect functionality. Color: As shown Material: Plastic Package Contents: 1 set * Sound Module Only the above package content is included; other items are not part of the package. Note: Due to light reflection and differences in display screens, the color in the image may slightly differ from the actual item. Measurement error allowance is +/- 1-3 cm.