Many cordless telephones have a handset speakerphone as well as a base speakerphone. The device also includes a microphone so it can be used as a speakerphone. The handset speakerphone allows hands free conversations away from the base unit. The speaker comes with LiveAudio and speakerphone capabilities. It was intended for speakerphone conferencing applications. The user could then converse with another caller hands-free, much like a regular speakerphone. RoundTable was a plug-and-play USB device that also functioned as a standard PSTN speakerphone. However, it lacks a camera, speakerphone, or outer display. The Cosmos contains a full duplex speakerphone with external volume controls. AAC users can set their device next to a speakerphone. Big Jambox is rated as class one speakerphone. This product was the first "echo-free" speakerphone for use in conference rooms. Their cost is also higher than for a half-duplex speakerphone. It was basically a hands-free speakerphone built into the television set. The base speakerphone is located in the base unit.