The Intellivoice Voice Synthesis Module, commonly abbreviated as Intellivoice, is an adapter for the Intellivision, Mattel's home video game console, that utilizes a voice synthesizer to generate audible speech. The Intellivoice is a large, brown cartridge that plugs into the Intellivision's side-mounted cartridge slot; games specifically designed for the device can then be inserted into a slot provided on the right-hand side of the module.