Talk Back Control- The wicked talkback squeal/screech is almost removed with the SR-955HPC’s self-sufficient talkback circuitry. You can adjust the volume to the ideal level as operating conditions require. Now you do not have to turn down your microphone due to squeal and noise. has the best talkback control system with no squeal. Also whenever you don’t want to hear yourself, all you have to do is turn the knob off. There is no distortion and noise with this feature. Scan your favorite channels or frequencies Instant CH19/9 button +10KHz Switch Large Square S/RF SWR Meter Advanced NB/ANL Circuit Reduces Interference AM/FM Operation and PA Circuitry