1. Five buttons to control music play/pause, up/down switch, adjust volume up/down. 2. It can be connected to the computer through the MINI-USB interface, used as a U disk, and downloaded directly from the computer MP3 songs. 3. SPI Flash and TF are used to store MP3 songs, two choices -, when they exist at the same time,TF card playing priority. 4. On-board SPI Flash can realize related functions, which is more affordable. 5. With 3W external power amplifier. Please note:You need prepare 3x AA battery and TF card. This product can realize MP3 song playback, support the card, Support USB download, with small size, light weight, The advantage of simple operation can be connected to the human body infrared sensor module. Note: The songs or record format must be MP3 Color: As Shown Material: ABS+PCB Package Contents: 1set x DIY human infrared sensing voice module(Without TF card) 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.