Mid-BT Bass Treble Board,Voice & Music Inbuilt Gain Control,Suitable All 2 Channel Stereo Amplifier Left and Right,Bass and Treble, DC 15V to 40V Dual Supply

for MID-BT 2 Channel Bass Treble Board Stereo, Improved Passive Preamplifier Board; (Voice & Music Inbuilt Gain Control) Giving The Sound Rich Detail,Dc 15v To 40v Dual Power Supply