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Pros
Pro Many manufacturers
IKEA, Ledvance, OSRAM, Philips, Schneider Electric, Aquara, Sonoff and more use Zigbee in their devices.
Pro Ultra low power
You won't find anything that uses less energy.
Pro Every device can be a router
Every Zigbee device can also be a router that enhances your network range.
Cons
Con Low range
Range distance is the lowest you'll find compared to other solutions.