According to Amazon, there are more than 30,000 smart home devices marked with the "Works with Alexa" badge — and if something works with Alexa, it works with Echo too. There's a whole host of smart home items you can connect to your Echo device, including light bulbs, switches, locks, thermostats, fans, and smart plugs that can turn pretty much any electronic device into a “smart home” device. Amazon's own brands (like Blink and eero) make a ton of smart home devices that will link up seamlessly, but Echo devices — especially those with a built-in Zigbee smart home hub — should be able to connect to any brand of smart home device fairly easily with the command "Alexa, discover my devices." (To be clear, though, Zigbee isn't required for connectivity) Echo devices also work exceptionally well with each other. You can link as many of them together as you want, and you can even have them play the same music at the same time for a whole-home audio experience, or act as an intercom to let your family know dinner is ready.