X-PAND keeps a radio that's built to last 25 years from being obsolete in seven because you can switch to 12.5 kHz and preserve audio quality. X-PAND technology actually compresses your voice at transmission. At the receiving end, it expands it while simultaneously reducing extraneous noise. X-PAND technology at 12.5 kHz can actually out perform 25 kHz sound quality, available only in the Motorola Radius 1225 Series.