• Input voltage: DC 9-24V (recommended dc 24V)
• Audio source input:  stereo input by bluetooth / TF card / USB flash disk
• Output impedance: 8Ω best (it can drive 4,6,8,16 ohms speakers)
• ouput power: maximum 2 x 50W
• support format: For MP3 / WMA /WAV /FLAC
• This board automatically enters pairing mode after power on, the device name is: Bluetoth
  
• with reverse polarity protection function
• size(L * W * H): 81.5mm * 51mm * 12.3mm / 3.2" * 2" * 0.48"