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Wii Speak is a microphone accessory for Nintendo's Wii home video game console. Connected to the console via USB, the device can be placed near the video display, which allowed voice chat to be conducted within entire rooms across multiple households. [2]
An electret microphone is a microphone whose diaphragm forms a capacitor (historically-termed a condenser) that incorporates an electret. The electret's permanent electric dipole provides a constant charge Q on the capacitor.