Z-Wave is the simpler, but ultimately a proprietary protocol, with chips only available from one company. Zigbee is the more flexible, open protocol with chips available from multiple manufacturers, and can be configured for any short-range wireless task, but it uses the crowded 2.4GHz band. The new Echo Plus includes a built-in Zigbee hub, perhaps for that reason.⌠Read More  (https://www.androidbuffet.com/2018/02/07/episode-382-zigbee-z-wave/)
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