For monitoring operations with extreme parasitic noise, we recommend the PKI 2170 Digital Stereo Transmitter Recorder. Via the built-in directional microphones, the stereo unit once records the left side and the right side. During playback, switching over or fading out is possible depending on the level of parasitic noise so that an acceptable audio signal can be understood. In case of particularly difficult circumstances, we recommend our PKI 2170 Digital Stereo Transmitter Recorder.