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very cool, but too bulky for what it is. for just 4$ you can have this one https://www.aliexpress.us/item/3256806558695914.html

> too bulky for what it is. for just 4$ you can have this...

...thing that is 2 inches across and 0.5 inches tall to use as a doorbell button?

+ an external power supply

Doesn't it also need a Zigbee gateway?

a single gateway, hundreds of buttons. One power supply, not hundreds!

This does not look waterproof.