Ever wonder whats inside a z-Wave switch?

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Well since I just got my warranty replacement device and they never asked for the old one back I decided to do a fun tear down.
This is a Jasco/GE Z-wave + Switch

You can see in these two pictures the red Z-Wave antenna

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The back comes of very easy and reveals the posts, some caps and a relay and anyone know what that yellow thing is?

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Here you can see the smarts of the board

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And here you can see the connector that makes contact if you pull out the all off button on the face of your switch

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Then the back of the one board with the IC on it. There is a lot going on inside this little switch and it seems like the one board is the high voltage and the other is low voltage and is air gaped

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I killed a GE Fan Controller a while back when didn't turn off the breaker or pull the air gap switch when swapping out the fan and accidentally grounded the load wire. Apparently there's a bit of current leakage when the controller is off and a small spark ensued after which the unit was dead.

I pulled it apart and it looked very similar. I haven't attempted to replace it yet but under the shrink sleeve tubing you'll find a soldered-in fuse. I'm guessing (in my case at least) that's what blew.

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https://tenta-tw.en.alibaba.com/product/60764600531-213411902/TENTA_MKP_X2_capacitor_0_027uF_275VAC.html

Looks like the yellow device is a capacitor