The remaining units we have were purchased and returned unused, however they do not include the 4 screws that attach the cube to the base unit and the anti-static packs have been opened up. If you purchase these, you do so with the understanding that they will arrive in this condition!
INSIDE THE PIXHAWK 2 CUBE 2.1
An STM32F427 Rev 3 Flight management unit. (where the flight controller lives.)
An STM32F100 I/O processor with pass through capabilities for failsafe. (deals with the Receiver and outputs )