The power and directionality rules for ISM bands are good guidelines for not interfering with other's use of the band. If you have another story that makes inte

The power and directionality rules for ISM bands are good guidelines for not interfering with other's use of the band. If you have another story that makes interference unlikely, it probably also makes it unlikely to get caught. Plenty of items for sale on Amazon don't have any silkscreen on chips or boards, much less an FCC id. If they can get away with it...