Sonoff mini zigbee

Hello everyone.

Im looking to add some sonoff mini's ( zigbee) to my setup. I noticed the wifi switches has antennas, but the zigbee switches dont. My boxes are metal behind my switches.

Hows the connection stability?

Thanks in advance.

I have one installed in a metal fixture box, it works fine. I do have a plug-in Sylvania outlet about 15 feet from it used solely as a repeater.

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Thanks.
I was just checking before I ordered them.