ITEM NAME:PT2399 Karaoke OK Microphone Reverberation Audio Pre Amp Amplifier Reverb Board PT2399 Karaoke Microphone MIC Reverberation Reverb Board Audio Pre Amp Amplifier Module SPECIFICATIONS.(PT2399 Karaoke Microphone MIC Reverberation Reverb Board Audio Pre Amp Amplifier Module. 1 x Karaoke Reverb Board. Suitable for: CD, VCD, DVD, TV Stereo, Karaoke Machine. 5) All the similar product in the world no matter for the finished device or assembled board when the microphone close to it,it will cause the whistle,it can't be eradicate.
