Uniden BC15 Bearcat 15-Watt External Speaker for Scanner CB RadiosStereo Plug for Scanner CB Compatibility Elbow 3. 5mm Stereo 15 Watts This 3. 5 Inch speaker may be small but with its 500hz 5kHz it brings more balance to your already rock'n Uniden speakers. With its Scanner and CB capability you will be able to hear communicate with ease. The noise blanker will help reduce any electrical noise that usually happens with incoming calls.