Uniden PC78XL 40 Channel CB Radio with Front Mic Two-way CB radio operates on 40 FCC-approved AM frequencies, with instant access to emergency channel 9 Dynamic squelch control reduces noise to produce clear, audible signal on every channel 'Delta Tune' fine-tuning feature for improving signal and avoiding bleed from adjacent channels Multi-function analog meter measures signal strength, RF output power, antenna SWR Front-positioned microphone with extra-long, coiled cord for convenient use