Discover more about the Calisto Headset of Imac/Mac. What you may not know is that your Mac does not come with a useful speech tool built in. I may have to try this for my computer since mine is Mac. MacSpeech Calisto Headset with Bluetooth USB adapter. And you can buy the Go Solo with the Calisto Headset which is only $149. But you can purchase the other kind of MacSpeech Dictate/Plantronics Caslisto Headset. So buy now!