Good way to control 433mhz mains sockets with Alexa and openhabian 2.4.0?

Setup, Configuration and Use Beginners
3

RFCOM device will interact with 433 devices.

http://www.rfxcom.com/en_GB

there is a binding:

Or otherwise, there is RFLink a bit more DIY, but I managed to get it running on my system. a bit cheaper to put together and can also work with 433Mhz, 315Mhz, 915Mhz or 868Mhz devices as well as 2.4Ghz (I originally used this to control Milights)

and there is a binding:

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