You don't really need any accessories in order for it to work. Standalone, the Echo works as a music player, a way to find information (such as weather and traffic updates), and a way to order things from Amazon and some partners (like Uber and Dominos). To fully utilize the Echo's power, however, you'll want to pair it with other smart home devices such as smart bulbs (Phillips Hue or Lifx) or Logitech Harmony Hub.