It's just an ADS-B In unit, like most others as far as I know.  Dual-band receiver, and provides WiFi out.  GPS with WAAS.  The DX model has AHRS, which iFly uses to more accurately sense pitch/roll/yaw.  I bought it at some discount before Stratux was catching on, though I built my own Stratux later to use in another plane.  The Stratux sits on a shelf collecting dust -- too finicky, and I didn't add all the bells and whistles to make it even comparable to the SkyRadar.
Look at their website for more info.