Uniden’s Professional Series PRO520XL Heavy-Duty CB radio offers a full 4 watts transmit power, with RF gain control, and 40-Channel operation in a compact rugged construction CB radio. | The PRO520XL has a front mount 4-pin electret microphone with extra-long coiled cord, S/RF LED meter, instant emergency channel 9, transmit indicator lights, Automatic Noise Limiter switch, Public Address switch, Volume control, Squelch control, and more. | Extremely popular for Industrial, Commercial, and Off-Road use. Easily fits in most any vehicle because of its compact size. | Built-in External Speaker Jack allows connecting to an optional external speaker, and you can use the Public Address function to be heard outside your vehicle with an optional PA speaker. | A superheterodyne circuit with phase locked loop technology assures precise frequency control. Included in the box: CB Radio, Microphone and Hook, Mounting Hardware, Knobs, Mounting Bracket, User's Manual. CB Radio antenna required, not included, sold separately. | 40-channel mobile CB radio with superheterodyne circuit/phase locked loop for precise control | Built-in automatic noise limiter and auto-squelch to eliminate noise and improve communication | Signal/RF meter and LED indicators to monitor activity; instant channel 9 access for emergency situations | Connect external speakers and use PA/CB switch for use as a Public Address system | Front-positioned microphone with extra-long, coiled cord for convenient use