Answer 2: Enamel is the hard material that coats your teeth, and is made mostly of a mineral. However, we call other things enamel. There's enamel paint, which is totally different, and there's also porcelain enamel, which is used to make a lot of dishes.
All of this is due to Amazon's unique approach with the Echo. It's not a portable speaker like we've seen from Jambox and Logitech. Instead, it's a rather large, cylindrical device that needs to be plugged into power. It's something you'll likely just leave in a single spot in your home.
Your speakers, naturally, need to be turned on for the Echo Dot to work. In the interest of energy conservation, that's not something I'm willing to do 24/7. So I've taken to disconnecting the Echo Dot from my bedroom speaker most of the day, and instead rely on its embedded speaker for simple commands.