anyone from Smart Bro or Smart Communications here?

i would like to know more about this..
http://www.smart.com.ph/Corporate/Ne...tBroPlugIt.htm

a) How does this work?
b) Does the device use a 3G signal? What if the location does not have a 3G signal?
c) Does this work with Windows Vista?

i'm planning to get one to expand my mobility. Pero i have to have some clear answers on the questions above.

Thanks.