This module attaches to the cartridge port of your Intellivision, and through the use of special voice-enhanced games, the Intellivision could emit intelligible speech. This was groundbreaking for 1982! The module has a dial on the front to control the voices’ volume. Voice audio was included in the TV output (unlike voice add-ons for other systems like the Odyssey 2 Speech Synth).
Marketing and sales were so bad that stores would not allow them to take up shelf space, so with Mattel warehouses full the company gave them away after purchase of Master Component in 1982 with a mail-in coupon; few consumers even sent in their coupon for the free voice module.
Media Links:
media0101.intvprime.com/ba4ef/intellivision-echo/Hardware-Components/Intellivoice/Intellivoice-Brown.png
media0101.intvprime.com/ba4ef/intellivision-echo/Hardware-Components/Intellivoice/Intellivoice-White.jpg
youtu.be/5t75IUJTwRA
Source Links:
web.archive.org/web/20210303060027/www.atarimagazines.com/cva/v1n1/vgupdate.php
web.archive.org/web/20160729190509/www.intellivisionlives.com/bluesky/games/credits/voice.html
history.blueskyrangers.com/hardware/intellivoice.html