Zigbee Protocol - an overview | ScienceDirect Topics
A ZigBee Radio Tutorial for the non-RF Expert - EE Times
The CC2430 ZigBee wireless module &Giving SMA antenna
Mini Touch-Plate Low Voltage Powered Relay - Zigbee Wireless Control
Zigbee - Wikipedia
Sonoff SNZB-01 Zigbee Wireless Switch, Supports To Create Smart Scenes, Trigger The Connected Devices on Ewelink APP With Three Control Options,Sonoff ZigBee Bridge Required.(Battery Is Not Included)
2GIG HUSBZB-1 USB Stick with Z-Wave & Zigbee Radio