It's a speaker. It's a music system. And much more. The Amazon Echo is a new cloud-connected gadget designed around your voice. Always on, you wake it by saying "Alexa", then asking it questions or giving it commands. Want to know the weather? Just ask. Want to add something to your shopping list? Done. In the mood for some Beatles? Say the words. With dual down-firing speakers, it produces surprisingly rich sound, and thanks to integrated Bluetooth, it also syncs with the Echo app, and lets you stream music from any source you want — although you probably won't have to use the feature very often, as it offers built-in support for your Amazon Music Library, Prime Music, TuneIn, and iHeartRadio.