Feature●Installs inline between antenna & radio●Helps Reduce Noise & Interference entering through the Antenna Coax●Has Min, Max & Off Selector switch●For CB & Amateur Ham radios, 24-30Mhz, 50W p.e.p maxDescription Inline Antenna noise reducer for CB & Amateur radios operating between 24-30Mhz. Min-Max-Off selector. 20W AM, 50W p.e.p SSB max input