product name: the sun/smiling face megaphone PCBA
Support: USB/MP3 / TF card/radio FM/external audio source input LINE IN/DC7.4 V/digital tube LED/microphone interface/knob switch
The key operate, repeated the play button, a song/volume decrease, the next song/volume up, the play/pause/FM
The product model: MD18, card small speakers decoder board PCBA (support: TF card + FM + memory + line + headphones + USB charging the power switch + lyrics)