BEAD ZCAT2035-0930A-BK FOR M504 6910013530BEAD ZCAT2035-0930A-BK FOR M504A6/A24 Headset Noise Modification
There can be a "whistling" noise audible when using a headset. This is due to RF feedback. When this occurs, the transmitted RF signal is detected by the microphone and is remodulated, producing the noise. This can occur in any air band headheld radio. This is designed to mitigate the audible noise.
