Working Voltage:DC 3.3V-5V Support TF card U disk Support FAT12, FAT16 file system Support MP1 Layer3, MP2 Layer3, MP3 Layer3, WAV version of the song Support 8-448kbps MP3 songs With a two-channel audio power amplifier ic (power 2* 3W) Dimension:6*4.5cm Package including: 1pcs LN4863 Amplifier U Disk Decoder MP3 FM Decoder Module 2*3W