It's an all or nothing thing I think. Same goes for an ebook reader like a Nook or Kindle. They don't have the time to deal with people sneaking in exceptions, so a blanket "anything with an off swtich" applies. I understand it, but fundamentally a lot of it is silly.
This was taken on the way to Hahn Winery, it's in the Salinas Valley, America's Salad Bowl.