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Do you mean the provided power adapter?

Well, there are a limited number of WiFi dongles that are supported by the hub, if your hub is on platform 2.2.5 or higher. This provides a convenient way to locate the hub more centrally.

It does require about $15-20 worth of hardware:

  1. a USB OTG cable (about $6-7)
  2. a supported WiFi adapter (about $10-15)

Here's a link to the original announcement: