15 buttons to control music play/pause, previous/next song switching, and volume adjustment. Connects to a computer via MINI-USB port and functions as a USB flash drive for direct MP3 file transfer. Features onboard SPI Flash memory for cost-effective storage and operation. Built-in 3W external amplifier. Supports both SPI Flash and TF card for MP3 playback; if both are present, the TF card takes priority. (TF card not included). Plays MP3 format, supports TF card input, and allows USB download. Compact size, lightweight design, simple operation. Compatible with human infrared sensing module. Product appearance and printed text may vary by batch, but functionality remains unchanged. Color: As shown. Material: Plastic. Package includes: 1 x Sound Module. Items shown in images other than the sound module are not included. Note: Lighting and display differences may cause slight color variations between the image and the actual item. Measurement tolerance: +/- 1-3 cm.