Bang & Olufsen BeoCom 4 Single Line Telephone  (Black) As with all Bang & Olufsen cordless telephones, the sound quality is simply the best in the market. It reproduces the caller's voice with remarkable clarity and authenticity, thanks to the interaction of a specially designed loudspeaker with digital sound processors. The simple shape of BeoCom 4 is an indicator of its straightforward purpose - as a walk and talk cordless phone for the home. 3 year warranty