https://techcrunch.com/2018/09/18/amazons-new-toolkit-helps-developers-build-echo-connected-accessories/

Amazon wants developers to build their own Alexa Gadgets. As you may recall, Amazon last year launched its own gadgets – those weird, Bluetooth-connected Echo Buttons – but told us this year at CES that it had plans to open up gadget-building to the wider developer community. Now, it has. The company today is launching the Alexa Gadgets Toolkit into beta, allowing developers to build accessories that pair with Echo over Bluetooth.

The gadgets themselves could use things like lights, sound chips, or even motors, and can work with Alexa interfaces like notifications, timers, reminders, text-to-speech, or wake word detection. For example, you could create a device designed for outdoor use that chimes when a timer has concluded, or a switch that drops dog food into a bowl when an alarm expires. A pill box could chime or flash to remind you to take medications, and so on.