FCC Certification is a pretty big deal in the US. Electronic devices have to be professionally tested for radiated emissions (radio waves) which could interfere with other devices as well as conductive emissions. Even if you don't have a wifi radio or other emitter, chips like the CPU and DDR memory emit radiation which has to be kept under legal limits.
The Winston device itself passed radiated emissions testing pretty handily. We initially ran into a problem with conductive emissions but it turns out that this was caused by a poorly designed power adapter which was leaking high frequency signals back into the source power supply. Once we swapped it with a higher quality adapter (ie: the kind we'll be shipping with the unit), everything was in compliance.