You use a hub. We will send you a hub (free of charge) if you pledge for more than one sensor,
There is no difference between the two except only 200 Knuts will be released at the $80 reward level. You get the internal temperature sensor with both.
Please send us a request! We are working with a few backers already to bring them their sensor of choice.
No, you will only read alert emails. Data emails are sent to an email address that you set up specifically for Knut(s). The Knut interface handles all reading and graphing of data emails from this email address.
Yes you can! We set up a shopping cart for Knut, sensors, and tshirts, just like in the original project. http://hitekelec.com/myknut
Don't see the answer to your question? Ask the project creator directly.