The Kenwood DSP-100 digital signal processor converts the signal into a digital waveform. This can yield greater signal purity with increased suppression of unwanted sidebands during SSB operation and improved CW operation. The DSP-100 plugs into the left panel of the TS-450S/690S/TS850S). Physical: 10.6 x 2 x 11.5 inches. Operates from 120 VAC. The DSP-100 rear panel provides jacks for simple plug in connection the transceiver via supplied cable.