Rakstore 2pcs PT2399 Microphone Reverb Plate Reverberation Board No Preamplifier Function Module

Working voltage: DC 6-15V, Board size: 50mm x 50mm, Note: The board is a separate reverb board, without microphone preamplifier., R27 is the reverberation depth resistance. If you want to adjust it, please remove R27 and connect the potentiometer to the S-G-G pad. The potentiometer value range is 20k-50k.