It's tough and powerful with a rugged front mic, a 40-channel auto noise/noise blanker switch, instant channel 9, dynamic squelch control, an RF gain, a mic gain, and a channel selector. The PC 78XL also offers a TX/RX indicator, SWR calibration, S/RF/SWR/Mod with a meter and antenna warning.As part of Uniden's Professional Series, the PC78XL CB offers 40-channel operation with an auto-noise/noise blanker switch. Its adjustable squelch and gain controls enhance performance. This model operates on any of the 40 AM frequencies authorized by the FCC. Its signal meter, antenna warning, and several LED indicators let you monitor activity at a glance. The front-positioned microphone has an extra long, coiled cord for convenient use. This unit also offers instant channel 9 access and soft wave radio (SWR) calibration.