Adding ZMatter - power supply needed?

[Kentinada]

I want to add the Zmatter USB to my Eisy.  The store Zmatter page shows a 12V power supply at the bottom as a Related Product.  Do I need this or does the device draw its power through the USB connect to the Eisy? 

[Techman]

The Zmatter dongle is powered by the eisy, you don't need an additional power supply