15 buttons to control music play/pause, previous/next song switching, and volume adjustment. 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. Features onboard storage to enable core functions with cost-effective design. Equipped with a 3W external amplifier. Supports MP3 playback from TF card or onboard storage; if both are present, playback defaults to the TF card. (TF card not included) Supports MP3 format, TF card, and USB download. Compact size, lightweight, and simple operation. Compatible with human infrared sensing module. Product appearance and printed text may vary slightly by batch, but this does not affect functionality. Color: As shown Material: Plastic Package Contents: 1 set x Sound Module Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement error allowed is +/- 1-3 cm.