5 buttons, control music play/pause, switch up/down music, adjust volume up/down Description: This product can play MP3 songs, supports TF card, USB download, has the advantages of small size, light weight, and simple operation. It can be connected to human infrared sensor module SPI Flash and TF are used to store MP3 songs, choose one of the two, when they exist at the same time, TF card playback priority It can be connected to a computer via Mini-USB, used as a U disk, and download MP3 songs directly from the computer With 3W external power amplifier, Weight: 0.21164377152 pounds, Manufacturer: Tuidzljd