Cordless telephone is a wireless version of a conventional telephone. It is made up of two units – a mains-powered base unit which is connected to the telephone line, and a battery-powered wireless hand set which is used for talking. Both the base unit and the hand set have built in low-power radio transmitters and receivers for two-way communication which operate at a pre-set frequency. When an incoming call arrives it is received by the base unit which passes it on to the handset via coded radio signals. The handset antenna picks up the signals and gets linked to the calling line. Similarly when the person called talks into the handset his or her voice is transmitted to the base unit via radio waves and on to the telephone line. The two parties can now talk as on a conventional phone. Most cordless phones operate only within a range of a few hundred metres.
