SMAKN&reg; Mp3 Lossless Decoders Decoding Power Amplifier Mp3 Player Audio Module Mp3 Decoder Board support TF Card USB Mp3 lossless decoders power amplifier Mp3 player module Mp3 decoder board support TF card and USB. Support MP3 format, playing power on automatically, playing state red LED indicator update. Super quality, onboard 2W single channel power amplifier. Support TF Card (mobile phone memory card), U disk playback mode With the speaker terminals without welding, convenient wiring Module design and convenient refit. Can be set button.