Wow,the price is really steep, but I also could not find info on the hardware they use to interface with OBDII for Dashcommand. I think there is most likely additional cost for a wifi enable d device that plugs in to OBDII and forwards this data to the mobile app.

Another nerdier but cheaper route is to use Arduino with ELM interpreter: http://www.cs.purdue.edu/homes/millerrv/Ryan_Miller/Projects...