A cordless phone that supports several handsets with only one base station. The advantage of such units is that the additional handsets can be more conveniently located as they require only power to charge the handset battery and not a phone line. See DECT
and cordless phone
In the Kitchen
The base station must be connected to the telephone line, but the handsets need only power for charging. AC outlets are widely available throughout a house, such as in this kitchen.