Toshiba offers the optimum performance of 900 MHz Spread Spectrum (SS) transmission. Spread Spectrum (SS) provides greatly improved security, virtually noise-free conversation, and extended-range transmission. With the advanced noise reduction system, sound quality rivals that of a wired model. By compressing, then decompressing signals between the handset and base, it "squeezes out" static and noise for remarkably crystal-clear sound. Answer a call just by touching any button on the handset.