Zigbee, like Z-Wave, is a communication protocol that allows for control of smart home devices and sensors without the need for a Wi-Fi connection. These are the Zigbee products I personally use and recommend.
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This is the backbone of my Zigbee and Z-wave network. This nice little stick supports both protocols.
This is a basic smart plug that also increases the range of your Zigbee network, which is what I primarily use it for.
The Amazon Echo, in addition to being a great smart speaker, can also control Zigbee devices.
The Zigbee version of a multi-sensor that I’ve used. Includes vibration, temperature, and humidity.