Wii Speak is an accessory for the Wii console that allows the player to talk with others around the world without the need for a headset. The device can be placed near a television and anyone in the room will be able to talk. If you have this acsessory, you are also able to download the Wii Speak Channel.
It was revealed during E3 2008 along with Animal Crossing: City Folk for the Wii on July 15, 2008. On the showfloor it was also announced that third party title The Conduit would also use WiiSpeak for its 16-player battles. If you were to plug the Wii Speak into a computer, it would be identified as "Wii Party-mic" and not work on the computer.