Boombox is a colloquial expression for a portable cassette or CD player with two or more loudspeakers. Other terms known are ghetto blaster, jambox or radio-cassette. It is a device capable of receiving radio stations and playing recorded music (usually cassettes or CDs), usually at relatively high volume. Many models are also capable of recording (onto cassette) from radio and (sometimes) other sources. Designed for portability, most boomboxes can be powered by batteries, as well as by line current.