ClearSpeech Speaker Digital Noise Filter.
Plug this DSP filtered speaker into your radio speaker output and enjoy much clearer audio. 12v cable and 3.5mm audio cable included. Noise filter has on off slide switch for noise and on off toggle switch for overall power. Noise filter is either on or off by slide switch. You will appreciate the level of background noise eliminated when turned on. Shipped to lower US 48 states only. Price includes shipping. Only United States Postal Money Order accepted.